what happens when calcium is released to permit muscle contraction?

Answers

Answer 1

Calcium is a significant player in the regulation of muscle contraction. The binding of calcium ions to specific sites on the actin molecule causes the tropomyosin molecule to slide off the actin filament's binding sites, allowing myosin heads to attach and begin pulling the thin filament toward the center of the sarcomere.

This causes the muscle to contract.During the process of muscle contraction, the sarcoplasmic reticulum releases calcium ions (Ca++) into the muscle fiber's cytoplasm. As a result, the calcium ions enter the cell and interact with troponin molecules located on the thin filaments in the muscle fibers. This, in turn, triggers a series of chemical reactions that result in muscle contraction.The sliding filament theory is the most well-known theory of muscle contraction. When muscle fibers are stimulated, they contract by sliding the thin filaments across the thick filaments, producing muscle force. The myosin molecule has a globular head with an ATP-binding site that connects to the binding site on the actin molecule. The muscle contraction is initiated by the formation of actomyosin cross-bridges and the subsequent rotation of the globular head on the myosin molecule, resulting in sliding of the thin filament.

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Related Questions

Many public locations, such as airports, hotels, schools, shopping malls, and coffee shops, are hotspots that provide Wi-Fi Internet connections to users with mobile computers or devices. Group of answer choices True False

Answers

The statement is true. Many public locations offer Wi-Fi connections as a convenience to their visitors or customers.

This is especially important in today's world where people are constantly connected to their devices and need internet access on the go. Airports, hotels, schools, shopping malls, and coffee shops are just a few examples of public locations that offer Wi-Fi connections. Users with mobile computers or devices can easily connect to these networks, providing them with internet access and allowing them to work, browse the web, or stay connected with friends and family. However, it is important for users to be cautious when using public Wi-Fi connections. These networks may not always be secure and can leave users vulnerable to cyber-attacks or identity theft.

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A sudden, violent expansion of ________ would be considered an explosion.

gas
water
fire
heat

Answers

The answer is a sudden violent expansion of gas
The missing word is gas

10. Describe what happens in the system shown below. (3 marks)



HELPP WILL MARK BRAINLIEST

10. Describe what happens in the system shown below. (3 marks)HELPP WILL MARK BRAINLIEST

Answers

Answer:

this is a circulatory system

in this system the purification of blood is occurs between the lungs and heart

Explanation:

please make me brainlist answer

In what way does the nucleus dictate the structure and function of the cell?

Answers

Explanation:

The nucles of living cells contains ganatic material that determines the entire structure and function of that cell.

Answer:

The main function of the cell nucleus is to control gene expression and mediate the replication of DNA during the cell cycle. The nucleus is an organelle found in eukaryotic cells. Inside its fully enclosed nucleus membrane, it contains the majority of the cell's genetic material.

Hope it helps :)

which two steps follow after Lysis in the experiment​

Answers

Explanation:

The cell must be lysed (broken open) to release the nucleus. the nucleus (if present) must also be open to release the DNA. at that point the DNA must be protected from enzymes that will degrade it, causing shearing. [[ once the DNA is released, it must then be precipitated in alcohol...]

Which part of the prokaryotic and eukaryotic cells contain the genetic material?

Answers

CELLS

In a prokaryotic cell the genetic material is found at the cytoplasm while in a eukaryotic cell the genetic material is found at the nucleus.

What are the colors of a plant cell?

Answers

Answer:

There are 11 Plant cell colors.

Explanation:

1. Light Blue - Cytoplasm

2. Light Purple -  Nucleus

3. Dark Purple - Nucleolus

4. Pink - Mitochondria

5. Orange - Golgi Apparatus

6. Light Green - Chloroplasts

7. Black - Ribosome

8. Grey - Vacuole

9. Blue -  Cell Membrane

10. Dark Green - Cell Wall

11. Red - Endoplasmic Reticulum

What role in the survival of the plant does the root of the beet plant likely have? A. it stores energy. B. it absorbs sunlight. C. it protects the seeds. D. it is involved in photosynthesis.

Answers

Answer:

A

Explanation:

It stores energy

Answer:

A

Explanation:

It stores energy

Which of the following statements about daughter cells are true? Check all that apply.

Daughter cells do not undergo cell division.

Daughter cells are the same type of cell as the parent cell.

Daughter cells can be a different type of cell than the parent cell.

Proper cell division balances the death of older cells with the creation of new cells.

Answers

Answer: the second and last one

Explanation:

Answer: B and D

Daughter cells are the same type of cell as the parent cell.

Proper cell division balances the death of older cells with the creation of new cells.

WILL GIVE BRAINLIEST!!!!!!
An amino acid is to a polypeptide as:

glycogen is to glucose.

testosterone is to a steroid hormone.

a phospholipid is to a plasma membrane.

a nucleotide is to a nucleic acid.

Answers

The second option, but please correct me if I'm wrong.

You identified a protein P as a putative tumor suppressor. No one studied the protein before. It has one SH3 domain, one PH (pleckstrin homology) domain, and one death domain. You have never seen this way of domain composition in any other protein. If you identify the protein functions, it would open a new research direction in cancer. What would you do to explore the protein functions?

Answers

To explore the protein functions of protein P, a putative tumor suppressor with unique domain composition, various experimental approaches should be employed.

First, analyze the protein's sequence and structural features to predict possible interacting partners and cellular pathways involved. Investigate its localization within cells through immunofluorescence or GFP-tagging. Perform functional assays, such as loss-of-function and gain-of-function experiments, to evaluate the protein's role in cellular processes, especially in relation to tumorigenesis.

Additionally, identify direct binding partners using techniques like co-immunoprecipitation, yeast two-hybrid screening, or affinity purification coupled with mass spectrometry. By studying the interactions and effects of protein P, you will gain insights into its role as a tumor suppressor and open a new research direction in cancer biology.

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Genes are
A.
of four types: adenine, cytosine, thymine, and guanine
B.
the proteins DNA wraps around to form chromosomes
C.
sequences of DNA that control a trait or traits
D.
the building blocks that make up proteins

Answers

I think the answer is B but I’m not so sure

Which muscle is not recruited to help elevate the rise? lower rise, middle, upper, floating?

Answers

The muscle that is not recruited to help elevate the rise is floating or the Psoas muscle.

What is the psoas muscle?

The psoas muscle is a deep-seated core muscle that helps stabilize the lower back and pelvis. This muscle works with the iliacus muscle to create the iliopsoas muscle, which is responsible for hip flexion and is commonly known as the “hip flexor” muscle.

The psoas is classified as a “deep” muscle, which means it is located below the surface muscles of the lower back and abdomen. Despite its deep position, it is a critical muscle for maintaining proper posture and biomechanics in the body.

It connects the lower lumbar vertebrae to the inner surface of the femur bone in the leg and serves as a crucial link between the upper and lower body.

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Which of these statements best explains how genes and proteins are related?

A. Genes are segments of DNA that code for proteins.

B.proteins are segments of DNA that code for genes

C.genes are the building blocks of proteins

D.proteins are the building blocks of genes ​

Answers

Answer:

The answer is A

Explanation:

I just took it

All of the following are true EXCEPT that melanin comes in two types, eumelanin and pheomelanin is processed by cells called keratinoctes production is influenced by external (e.g., UV radiation exposure) factors production is influenced by inherited factors.

Answers

All of the following statements are true except that melanin comes in two types, eumelanin and pheomelanin is processed by cells called keratinocytes.

All of the following are true EXCEPT that melanin comes in two types, eumelanin and pheomelanin is processed by cells called keratinocytes production is influenced by external (e.g., UV radiation exposure) factors production is influenced by inherited factors. All of the following statements are true except that melanin comes in two types, eumelanin and pheomelanin is processed by cells called keratinocytes. Melanin does indeed come in two types, eumelanin and pheomelanin, and its production is influenced by both external factors, such as UV radiation exposure, and inherited factors. However, keratinocytes do not process melanin. Instead, melanocytes are the cells responsible for producing and distributing melanin in the skin, hair, and eyes.

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Based on the graph, how would Cook County, Georgia, be affected in the future if the trend continues and aquifers are eventually depleted

Answers

We can see here that Cook County, Georgia, will be affected in the future if the trend continues and aquifers are eventually depleted in the following way: C. Farmers would have less or no water for irrigation

What is trend?

A trend refers to a general direction or pattern of change in a particular field, domain, or society over a period of time. It represents the prevailing tendency or inclination towards a certain style, behavior, concept, or phenomenon that gains popularity or widespread acceptance.

Trends can emerge in various areas, including fashion, technology, culture, business, social media, entertainment, and more.

The graph shows that the water level in the aquifer is decreasing over time. This means that there will be less water available for irrigation in the future.

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The complete question is:

Based on the graph, how would Cook County, Georgia, affected in the future if the trend continues and aquifers are eventually depleted?

USGS well 18H016, Cook County, Georgia

160

165

170

175

180-

185

1967

1974

1981

Year

1988

1995

2002

A. Land may rise because the weight of the water no longer compacts it.

B. It would become easier to cultivate crops.

C. Farmers would have less or no water for irrigation

D. Vegetation fed by groundwater would flourish.

the length of a particular gene in human dna, measured from the start site of transcription to the end of the protein-coding region, is 40,000 nucleotides, whereas the length of the mrna produced from this gene is 1000 nucleotides. what is the most likely reason for this difference?

Answers

The most likely reason for the difference in length between the 40,000-nucleotide gene in human DNA and the 1,000-nucleotide mRNA produced from this gene is the process of RNA splicing.

During transcription, the entire gene is copied into a pre-mRNA molecule. However, the pre-mRNA contains both coding sequences (exons) and non-coding sequences (introns).RNA splicing is a critical step in gene expression, where introns are removed, and exons are joined together to form a mature mRNA molecule.

In the given example, the difference in length between the DNA gene and the mRNA suggests that a significant portion of the DNA sequence consists of introns. These introns are removed during RNA splicing, leading to a much shorter mRNA molecule that is 1,000 nucleotides long.

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Al cruzar 2 moscas negras se obtiene una descendencia formada por 216 moscas negras y 72 oscuras blancas. A) Razone el cruzamiento y determine fenotipo y genotipo.

Answers

Answer:

Fenotipo: Moscas negras y moscas blancas.

Genotipo: Nn y nn.

Explanation:

Sabemos que al cruzar dos moscas un pequeño porcentaje de su descendencia es blanca y la mayoría negra. Por ende, hay dos alelos distintos para el color, uno codifica para moscas de color negro y el otro para las de color blanco. Como la mayoría de la descendencia es negra, el gen domiante es el negro, a este lo denominaremos con la N y al recesivo con la letra n.

Para que haya moscas blancas, las dos moscas que se cruzan tienen que ser Nn, es decir, su genotipo tiene que ser heterocigoto. Podemos verificar esto con un cuadro de Punnett:

  ║N  ║n

N║NN║Nn

n║Nn ║nn

Con el cuadro de Punnet vemos que la descendencia tiene los genotipo, es decir, los genes que un ser tiene, Nn y nn. El fenotipo, es decir, lo que podemos ver de los genes, sera moscas de color negro y moscas de color blanco.

Como el gen dominante es el negro, cualquier mosca con este gen expresara este color y solo las moscas con genotipo h0m0cigoto (nn) expresaran el color blanco.

Now choose one of the resources used for energy production that you have studied in this lesson. Describe how the way humans use or obtain this resource might impact the natural resource you described in part A. If you don't think the natural resource in part A is affected, explain why.

Answers

In general, the way humans use or obtain any resource can have a significant impact on the natural resources.

For example, if the resource is fossil fuels such as coal, oil, and natural gas, the extraction and burning of these resources can lead to pollution of air, water, and soil. It also contributes to climate change and global warming, which can have severe impacts on various natural resources such as oceans, forests, and wildlife.

What is the energy production about?

Mining and drilling for fossil fuels can also lead to habitat destruction and fragmentation, which can negatively impact wildlife populations and biodiversity.

The production and transportation of these resources can also lead to spills and leaks, which can harm aquatic wildlife and their habitats.

In conclusion, the way humans use or obtain resources can have a significant impact on the natural resources, and it's important to consider the environmental impact of different energy production methods in order to make more sustainable choices.

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What other fields, besides medicine, currently use gene editing?

Answers

Answer:

Cancer research

Cardiovascular disease

Metabolic diseases

Neurodegenerative diseases

Viral diseases

Hereditary eye diseases

Phineas and Ferb build a flying machine. They accelerate into the air in a
straight line, going from 0 m/s to 30 m/s in 3 s. Find their average
acceleration.

Answers

10

30 dived by 3 = 10

hope it helps

Which objective lens has the smallest visual field?Which one has the highest visual field?

Answers

a. Highest magnification lens

b. Lowest magnification lens

The objective lens with the smallest visual field is typically the highest magnification lens, such as the 100x objective lens. This is because higher magnification results in a smaller field of view.

Conversely, the objective lens with the highest visual field is typically the lowest magnification lens, such as the 4x objective lens. This is because lower magnification results in a larger field of view.

Lightweight microscopes have objective lenses that work together with cameras on mobile phones to provide magnification. Using phones with portable microscopes adds the ability to capture magnified images and send them to databases for analysis or store them in the cloud or locally on the phone for future examination.

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How do major geologic events help build Earth’s timeline?

Answers

Major geologic events play a critical role in building Earth's timeline. These events, such as volcanic eruptions, earthquakes, and asteroid impacts, leave behind distinct layers of rock and sediment that can be dated using various techniques. By analyzing the sequence of these layers, scientists can piece together a timeline of Earth's history and understand how the planet has evolved over time. Additionally, these events can also cause mass extinctions and drive evolution by creating new habitats and opportunities for species to adapt and thrive. Overall, major geologic events provide important clues for understanding the history and development of our planet.

I know adrenal but idk on the rest please help

I know adrenal but idk on the rest please help

Answers

Answer:

Pancreas is Insulin is released when blood sugar levels are too high

Thymus Gland is Your immune system fight off an infection

Pineal Gland is you begin to feel sleepy after a long session

Explanation: Hope it helps :)

the amount of air that remains in the lungs simply to keep them open is called the:

Answers

The amount of air that remains in the lungs to keep them open is called the functional residual capacity (FRC).

It is a vital measure of lung function and plays a crucial role in maintaining proper respiratory mechanics.

The functional residual capacity (FRC) represents the volume of air that remains in the lungs at the end of a normal tidal breath, when the individual is at rest and not actively breathing in or out.

It is the equilibrium point between the elastic recoil of the lungs (which tends to collapse the lungs) and the elastic recoil of the chest wall (which tends to expand the lungs). The FRC consists of two components: the expiratory reserve volume (ERV), which is the volume of air that can be exhaled after a normal exhalation, and the residual volume (RV), which is the volume of air that remains in the lungs after a maximal exhalation. The FRC is essential for maintaining the patency of the airways and preventing lung collapse, ensuring that the lungs are ready for the next breath.

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Place the structures involved in cerebrospinal fluid (CSF) circulation in order from the initial production of CSF to when the CSF is absorbed into venous circulation.
- arachnoid villi - median and lateral apertures - choroid plexus - ventricles - dural sinuses - subarachnoid space

Answers

The structures involved in cerebrospinal fluid (CSF) circulation in order from the initial production of CSF to when the CSF is absorbed into venous circulation are choroid plexus - ventricles - arachnoid villi - subarachnoid space - median and lateral apertures - dural sinuses.

Cerebrospinal fluid (CSF) is a transparent, colorless liquid that surrounds the brain and spinal cord. Its function is to supply nutrients and remove metabolic waste products from the central nervous system (CNS).

The initial production of CSF occurs in the brain's ventricles, specifically in the choroid plexus. Then, the CSF flows through the ventricles before entering the subarachnoid space.

The absorption of CSF into venous circulation takes place via arachnoid villi, followed by its drainage into the dural sinuses, and finally returned to the circulatory system.

Hence, the proper sequence of structures involved in CSF circulation is as follows: choroid plexus - ventricles - subarachnoid space - arachnoid villi - dural sinuses - median and lateral apertures.

Overall, CSF plays a critical role in maintaining the proper functioning of the CNS.

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Dr. Jablonski describes learning that low folate levels are linked to severe birth defects as a "eureka moment." Explain what she means by this.
discovered connection between darker skin colors & fitness related trait
lack of folate -> birth defects, and exposure to UV breaks down folate

Answers

Dr. Jablonski describes learning that low folate levels are linked to severe birth defects as a "eureka moment" which means that she has experienced a moment of sudden realization or discovery. This discovery has been crucial to the prevention of birth defects and the improvement of maternal and infant health.

The low folate levels were found to be linked to severe birth defects such as anencephaly, spina bifida, and other neural tube defects. Neural tube defects are severe birth defects that occur when the spine and brain fail to develop properly. Neural tube defects are considered to be one of the most serious birth defects because they can lead to lifelong disability and even death. Dr. Jablonski's discovery has helped to prevent these birth defects and improve maternal and infant health. The exposure to UV breaks down folate which could lead to a lack of folate, and thus to birth defects. Furthermore, Dr. Jablonski also discovered the connection between darker skin colors and fitness-related traits. This has contributed to our understanding of the evolution of human skin color. It was discovered that darker skin color is an adaptation that protects against the harmful effects of ultraviolet radiation. Therefore, people with darker skin are less likely to develop skin cancer, but they may also be more prone to vitamin D deficiency if they live in areas with low levels of sunlight.

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How Clark Developed Seizures
The following list is not in the correct order. The first three events are numbered correctly. Drag and drop the
remaining events in the order that led to Clark's seizures.


picture above for the order.

How Clark Developed SeizuresThe following list is not in the correct order. The first three events are

Answers

Answer:

4. Low blood sodium concentration

5. Net movement of free water into the matrix

6. Increased matrix pressure

7. Abnormal neuron firing rate

8. Seizures

Explanation:

Seizures are defined as the common complication of drug intoxication.

As per the clinical observations for Clark , normal blood and matrix sodium concentration lose sodium ions due to diarrhea. As given too much water causes sodium levels to decrease. Due to lower sodium concentration, the free water move into the matrix and increased matrix pressure. This pressure causes the abnormal neuron firing rate to increase which causes seizures.

Hence, the correct order is:

4. Low blood sodium concentration

5. Net movement of free water into the matrix

6. Increased matrix pressure

7. Abnormal neuron firing rate

8. Seizures

The ________ and __________ are the vessels in the fetal pig heart that is absent in adults.

Answers

The foramen ovale is the part of the adult heart that corresponds to the fetal heart's opening between its two atria.

In contrast to adult pig hearts, the foramen ovale is not present in fetal pig hearts. Between the right and left auricle, there is a little gap that allows blood to flow freely.

The foramen shuts immediately after birth as a result of rising pressure in the heart chambers, including the cessation of placental flow, which raises right atrial pressure, and the aeration and ventilation of the lungs, which raises venous return from the lungs and raises left atrial pressures.

During fetal development, blood can flow from the right atrium to the left atrium through a hole in the heart tissue called the foramen ovale.

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Please help with answer 3 :)

Please help with answer 3 :)

Answers

Answer:

1) Diffusion : Is the movement of molecules / ions from a region of higher to lower concentration. It may or may not occur across a semi permeable membrane.

In diffusion there is no challenge involved as it is along the concentration gradient, but in active transport movement of molecules occur against concentration gradient ie; from lower to higher concentration.

2) For active transport, energy is vital for movement, in this case protein molecules function as molecular pumps to enable the cell accumulate glucose/ions, against concentration gradient. Here metabolic energy ATP is required.

3)Facilitated diffusion is a type of passive transport in which ions/molecules cross the semi permeable membrane because permeases present in the membrane facilitate the transport.

Like simple diffusion facilitated diffusion doesn't require metabolic energy and simply occurs across the concentration gradient.

4) Osmosis : is movement of water from hypotonic solution (lower concentration) to hypertonic solution (higher concentration) through a semi permeable membrane.

The cell membrane being permeable to water allows to and fro movement of water molecules along the concentration gradient.

Other Questions
need help for Geometry EXPLAIN HOW THE FEAR OF COMMUNISM ENDED UP TURNING AMERICASOMETHING SIMILAR TO A TOTALITARIAN STATE. Please, explain the concept of the separation of church and state. On what date did the 16th century begin?1 January 20161 January 16011 January 16001 January 1501 which of the following most closely represents us retail sales in 2016? a.$5.5 trillion b.$550 million c.$5.5 million d.$550 billion Please read the internet news from The Guardian below and answer the following questions. "China has accused the US of ignoring international treaty obligations and engaging in irresponsible and unsafe conduct in outer space after two near misses between the Chinese space station and satellites operated by Elon Musk's SpaceX company, Zhao Lijian, a foreign ministry spokesperson, said on Tuesday that SpaceX's Starlink satellites had posed a serious threat to the lives and safety of astronauts onboard the China space station, Tiangong. In a note to the UN Committee of the Peaceful Uses of Outer Space earlier this month, China said Tiangong had to take "preventive collision avoidance control" during the two "close encounters", where the Starlink satellites had moved into orbits that obliged Tiangong's operators to change its course. Starlink, a division of Musk's private company SpaceX, has launched more than 1,600 satellites. It has permission from US authorities to launch a total of up to 12,000 in a programme aiming to provide internet access to most of the planet. According to an Astrophysicist, Jonathan McDowell, orbit is getting more crowded and It's a commercially dominated space age where we're stressing the space environment for the first time. He argued that evasive manoeuvres to reduce the risk of collisions in space were becoming more frequent owing to the number and speed at which satellites were being launched." a. Which IPE structures and levels is the internet news related with? Analyse these structures according to each level. b. What can be done against enormous increase of space junk? Please try to discuss and develop your own arguments by considering the global and local actors in the international Political Economy. What are the first two steps in solving the radical equation below?X+3 - 7 - 15A. Square both sides and then subtract 3 from both sides.B. Add 7 to both sides and then square both sides.C. Add 7 to both sides and then subtract 3 from both sides.D. Square both sides and then add 7 to both sides. 1 and 2 are complementary angles. m1 is 5y+32 and m2 is 7y-14. Find m2 & show your work. it was deleted last time I posted it??? 15 points Composition of Functions can someone please help me ill give you brainliest Read this sentence from the article. Rudolph was already a known quantity in the world of track. What does the idiom a known quantity mean in the sentence above? The elbow is __ to the index finger.The stomach is __ to the neck.The brain is __ to the spinal cord. The lungs are __ to the heart.The shoulder is __ to the esophagus.The toes are __ to the ankles.The trachea is __ to the clavicle (collarbone).The spine is __ to the liver. Which of the following could define a physical region?A a languageBa religionCa mountain rangeD political borders Another EMT informs you that a patient has been stabbed once with a knife in the right midaxillary region. Which description best identifies where is this injury located?Right lateral chest Select the statement that best describes how pollination begins. (2 points) aWhen a butterfly collects pollen from the ovule of a flower, it transfers the pollen to the pistil of another flower that it lands on. bWhen a butterfly collects pollen from the leaf of a flower, it transfers the pollen to the stamen of another flower that it lands on. cWhen a bee lands on a flower, it rubs against the stamen and collects pollen. When the bee lands on another flower, it transfers the pollen to the stigma. dWhen a bee lands on a flower, it rubs against the stigma and collects pollen. When the bee lands on another flower, it transfers the pollen to the stamen. Pls helppp due soon!! Which of the following statements about malnourishment is false?A.Fifteen percent of the world's population is malnourished.B.Protein malnourishment can lead to disease susceptibility.C.Protein malnourishment can be found even in places with abundant food supplies.D.Malnourishment is a result of overpopulation.Please select the best answer from the choices provided.ABCD Where do I plot the graph coordinates On a math test, Stephen missed 3 computation problems and 1 word problem for a total of 9 points off. Brad missed 2 computation problems and 2 word problems for a total of 10points off. This relationship can be represented by the system of equations below, where x stands for the point value of computation problems missed and y stands for the point valueof word problems missed.3x + y = 92x+2y= 10 Helppp meeeee plzzzzzxxzz