360° is all the way around a circle. The length of the intercepted arc is equal to the circumference of the circle.
Arc Length of a Circle:
Length. A practical way to determine the length of an arc in a circle is to plot two lines from the arc's endpoints to the center of the circle, measure the angle where the two lines meet the center, then solve for L by cross-multiplying the statement: measure of angle in degrees/360° = L/circumference.
Does arc length have to be in radians?
Arc length is a measurement of distance, so it cannot be in radians. The central angle, however, does not have to be in radians. It can be in any unit for angles you like, from degrees to arcsecs. Using radians, however, is much easier for calculations regarding arc length, as finding it is as easy as multiplying the angle by the radius.
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Which equation represents a circle with center (5,-1) and a radius of 16 units?
A (x-5)2 + (y + 1)2 = 16
B. (x-5)² + (y+ 1)² = 256
C. (x + 5)² + (y-1)² = 16
D. (x+ 5)² + (y- 1)² = 256
Answer: The correct option is B.
Step-by-step explanation:
The equation of any circle with a given radius \(r\) and coordinates of centre (\(\alpha\),\(\beta\)) is given by:
\((x-\alpha )^{2} +(x-\beta )^{2} =r^{2}\)
Here \(r=16\) ;
\((\alpha ,\beta )\)=\((5,-1)\)
Plugging in the values in the given equation,
We get:
\((x-5)^{2} +(x+1 )^{2} =16^{2}=256\)
what is the value of the expression
v/2 +(3/4 +w)
when v=1 and w= 5/8
a 1/8
b 3/8
c 5/8
d 1
The value of v/2 +(3/4 +w) when v = 1 and w = 5/8 is 1 7/8
What is substitution of variables?substitution of variables is a basic technique used to simplify problems in which the original variables are replaced with functions of other variables.
Since V = 1 and W = 5/8, by substituting 1 for V and 5/8 for w in the expression
v/2 +(3/4 +w) = 1/2+ ( 3/4 + 5/8)
= 1/2 + (6+5)/8
= 1/2 + 11/8
= (4+11)/8
= 15/8
= 1 7/8
Therefore the value of v/2 +(3/4 +w) when v is 1 , and w is 5/8 is 1 7/8
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What is the linear function equation that best fits the data set? 1) y = -2x + 5. 2) y = 2x + 5. 3) y = -1/2x + 5. 4) y = 1/2x - 5.
Without specific information about the data set, it is not possible to determine which equation is the best fit.
To determine the linear function equation that best fits the data set, we need more information about the data set itself. Without the data points or any other details, we cannot accurately determine which linear function equation is the best fit.
However, I can provide a general explanation of the four options:
y = -2x + 5: This is a linear equation with a negative slope of -2. It represents a line that decreases as x increases. The y-intercept is 5.
y = 2x + 5: This is a linear equation with a positive slope of 2. It represents a line that increases as x increases. The y-intercept is 5.
y = -1/2x + 5: This is a linear equation with a negative slope of -1/2. It represents a line that decreases at a slower rate as x increases. The y-intercept is 5.
y = 1/2x - 5: This is a linear equation with a positive slope of 1/2. It represents a line that increases at a slower rate as x increases. The y-intercept is -5.
Without specific information about the data set, it is not possible to determine which equation is the best fit. The best fit would depend on how well the equation aligns with the actual data points.
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Arianna's personal residence has an adjusted basis of $300,450 and a fair market value of $270,405. Arianna converts the personal residence to rental property. What is Arianna's gain basis
If Arianna decides to sell the rental property in the future, the gain or loss will be calculated based on the $270,405 gain basis.
The gain basis for Arianna's converted personal residence to rental property can be calculated by determining the lower value between the adjusted basis and the fair market value.
In this case, the adjusted basis is $300,450 and the fair market value is $270,405.
The gain basis is the lower of the two values, which in this case is $270,405. This means that the gain basis for Arianna's rental property is $270,405.
The gain basis is important for tax purposes as it is used to calculate the taxable gain or loss when the property is eventually sold.
If the property is sold for a higher price than the gain basis, there will be a taxable gain.
On the other hand, if the property is sold for a lower price than the gain basis, there will be a deductible loss.
In Arianna's case, if she decides to sell the rental property in the future, the gain or loss will be calculated based on the $270,405 gain basis.
It is important to note that there may be additional factors and adjustments that could affect the final tax calculations, such as depreciation deductions and any improvements made to the property.
Consulting a tax professional would provide more accurate and detailed information regarding the tax implications of selling the rental property.
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4cm
5cm
12cm
6cm
V=
What is the volume?
The calculated value of the volume of the prism is 120 cubic cm
Calculating the volume of the prism?From the question, we have the following parameters that can be used in our computation:
The triangular based prism
By formula, we have the volume of the prism to be
Volume = base area * Height
using the above as a guide, we have the following:
Base area = 1/2 * 4 * 5 = 10
Height = 12
substitute the known values in the above equation, so, we have the following representation
Volume = 10 * 12
Evaluate
Volume = 120
Hence, the volume of the prism is 120 cubic cm
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Find RS.
A. 12
B. 5
C. 10
D. 9
Answer:
5
Step-by-step explanation:
(2x - 6) + 1 + (x - 4) = 18
3x - 9 = 18
3x = 27
x = 9
RS = x - 4 = 9 - 4 = 5
Answer:
B. 5
Step-by-step explanation:
Pls mark brainiest if helpful!!
PQ + QR + RS = 18
This statement is equivalent to the following:
(2x - 6) + 1 + (x - 4) = 18.
This is because we substitute the line segments with their values.
Now that we have an equation to work with, we will solve it. We start by removing the parenthesis as they are not necessary here.
2x - 6 + 1 + x - 4 = 18
Next, we will make it, so x is alone on the left. We will do this by adding 6 and 4 to both sides
2x - 6 (+6) + 1 + x - 4 (+4) = 18 (+6) (+4)
After doing this we are left with the following equation:
2x + 1 + x = 28
Now we will subtract 1 from both sides to make x alone of the left side of the equation.
2x + 1 (-1) + x = 28 (-1)
After we solve this, we get the following:
2x + x = 27
We can add 2x and x and get 3x because 2 + 1 = 3.
3x = 27
We now simplify this equation by dividing both sides by 3.
\(\frac{3x}{3}\) = \(\frac{27}{3}\)
We again simplify the equation to the following:
x = 9
BUT THATS NOT THE ANSWER!
Now that we know what x is, we can solve for the value of RS.
We input 9 for x in the equation x - 4.
When we do this, we get 9 - 4 which is 5.
And this is our final answer!!
I hope I could help! Have an amazing day and good luck on your homework!
"You can't predict the future, but you can create it"
-Juliana Palazzolo, 2022
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╰(*°▽°*)╯╰(*°▽°*)╯╰(*°▽°*)╯╰(*°▽°*)╯╰(*°▽°*)╯╰(*°▽°*)╯╰(*°▽°*)╯
The length and width shown for this rectangular metal plate were rounded to the nearest centimeter. Which are possible areas of the plate if its actual length and width are used?
The possible areas of the plate will depend on the possible combinations of length and width that round to the given measurements. Let's consider an example to illustrate this.
Suppose the given length is 15 cm and the given width is 10 cm. If the actual length is 14.5 cm or greater, it would round up to 15 cm. Similarly, if the actual width is 9.5 cm or greater, it would round up to 10 cm. Based on these rounding rules, possible lengths for the plate could be 14.5 cm, 15 cm, 15.5 cm, and so on. Possible widths could be 9.5 cm, 10 cm, 10.5 cm, and so on.
To find the possible areas, we multiply each length by each width. For example, the possible area with a length of 14.5 cm and a width of 9.5 cm would be 137.75 square cm. By following this process for all possible combinations, you can determine the possible areas of the plate when its actual length and width are used.
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Which of the following is the Inverse of y = 3x?
a) f-1(x) = 1/3x b) f-1(x) = 3x c) f-1(x) = 3/x d) f-1(x) = x/3
The correct answer is d) f^(-1)(x) = x/3, as it represents the Inverse relationship of y = 3x.
To find the inverse of a function, we need to switch the roles of x and y and solve for the new y.
The given function is y = 3x.
To find its inverse, let's swap x and y:
x = 3y
Now, solve this equation for y:
Dividing both sides of the equation by 3, we get:
x/3 = y
Therefore, the inverse function of y = 3x is f^(-1)(x) = x/3.
Among the given options:
a) f^(-1)(x) = 1/3x
b) f^(-1)(x) = 3x
c) f^(-1)(x) = 3/x
d) f^(-1)(x) = x/3
The correct answer is d) f^(-1)(x) = x/3, as it represents the inverse relationship of y = 3x.
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Find one counterexample to show that the following conjecture is false.
You have the following sentence:
triangle ABC is right triangle, so angle ∠A measures 90°
In order to find a counterexample of the previous sentence, you simply determine which of the given triangle is a right triangle in which the measure of angle ∠A is not 90°.
You can notice that the option B is a right traingle where the angle A does not measure 90°, otherwise, angle ∠B measures 90°
2x+3
7. Find each value if f(x)=x²-2x-8 and g(x)=-2x+1
(b) f(-3d)
(a) f(3)
(d) g(5)
(e) g(3x)
(e) f(2a-1)
(1) g(-4a+8)
Answer:
Step-by-step explanation:
a. f(-3d) = (-3d)^2 - 2(-3d) - 8 = 9d^2 + 6d - 8
b. f(3) = (3)^2 - 2(3) - 8 = 9 - 8 - 8 = 1 - 8 = -7
c. f(2a - 1) = (2a - 1)^2 - 2(2a - 1) - 8 = 4a^2 - 4a + 1 -4a + 2 - 8 = 4a^2 - 8a - 5
d. g(5)= (2(5)+3)/(5^2 -2(5) + 1) = (10 + 3)/(25 - 10 + 1)= 13/15+1= 13/16
e. g(3x)= (2(3x) + 3))/((3x)^2 - 2(3x) + 1))= (6x + 3)/(9x^2 - 6x + 1)
f. g(-4a + 8) = (2(-4a + 8)) + 3/(-4a + 8)^2 - 2(-4a +8) +1))
(-8a + 16 + 3)/(16a^2 - 32a + 64 + 8a - 16 + 1)
(-8a + 19)/(16a^2 - 24a + 49)
You need to form a four-digit number using the digits 1, 2, 3, and 4. The number should satisfy the following conditions:
The thousands digit is three times the tens digit.
The hundreds digit is one more than the units digit.
The sum of all four digits is 10.
Can you find the number?
With detailed Explanation
The number will be 6,125.Given, we need to form a four-digit number using the digits 1, 2, 3, and 4. The number should satisfy the following conditions:The thousands digit is three times the tens digit.The hundreds digit is one more than the units digit.The sum of all four digits is 10.
To find: The four-digit number
Solution:Let us assume the digit in the unit place to be x.∴ The digit in the hundredth place will be x + 1∴ The digit in the tenth place will be a.
Let the digit in the thousandth place be 3a∴ According to the given conditions a + 3a + (x + 1) + x = 10⇒ 4a + 2x + 1 = 10⇒ 4a + 2x = 9……(1)
Now, the value of a can be 1, 2, or 3 because 4 can’t be the thousandth place digit as it will make the number more than 4000.Using equation (1),Let a = 1⇒ 4 × 1 + 2x = 9⇒ 2x = 5, which is not possible∴ a ≠ 1
Similarly,Let a = 3⇒ 4 × 3 + 2x = 9⇒ 2x = −3, which is not possible∴ a ≠ 3
Let a = 2⇒ 4 × 2 + 2x = 9⇒ 2x = 1⇒ x = 1/2Hence, the number will be 6,125. Answer: The four-digit number will be 6,125.
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Determine the completion time for the following IV. State time in both traditional and military time. Round minutes to the nearest whole number of minutes. (Enter numeric value only.) A liter of D5W is started at 2300 to infuse at 125 mL/hr. Determine the infusion time: a. h
The infusion time of a liter of D5W at a rate of 125 mL/hr will take 8 hours to complete. The completion time for the IV infusion is 7:00 AM (traditional time). The completion time for the IV infusion is 0700 (military time).
The completion time for the IV infusion is determined by calculating the infusion time and add it to the start time.
a. First, we calculate the infusion time (a):
Infusion rate: 125 mL/hr
Total volume: 1 liter = 1000 mL
Infusion time (a) = Total volume / Infusion rate
= 1000 mL / 125 mL/hr
= 8 hours
The infusion time is 8 hours.
Now, we calculate the completion time:
Start time: 2300 (11:00 PM)
The completion time is calculated by adding the infusion time to the start time.
Completion time = Start time + Infusion time
b. Using traditional time format:
Start time: 11:00 PM
Infusion time: 8 hours
Adding the infusion time to the start time, we get:
Completion time = 11:00 PM + 8 hours
= 7:00 AM
The completion time in traditional time format is 7:00 AM.
c. Using military time format:
Start time: 2300
Infusion time: 8 hours
Adding the infusion time to the start time, we get:
Completion time = 2300 + 8 hours
= 0700
The completion time in military time format is 0700.
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Complete question :
Determine the completion time for the following IV. State time in both traditional and military time. Round minutes to the nearest whole number of minutes. (Enter numeric value only.) A liter of D5W is started at 2300 to infuse at 125 mL/hr.
Determine the infusion time:
a. _____hr
b. Determine the completion time: _____AM (Traditional time)
c. Determine the completion time : _____ (Military time)
Pick all the correct statements from below. It is possible to have x
2
dx=0, ever when a pro 0 . ∥v
r
Av<0, then the matrix A rotates the vectore by moie than 90
∘
. The matrix B
2
AB is positive dehuite if A is pesitive thethite If the trace of a matik is zero, then it must be a singtalar matik. A rquare matrix and liss transpose both have the salle set of eheetwatiess A real shuare matix lias only real ehenvalues. Consider a matrix A∈R
6×8
whose rank is 4. Pick up the correct statements from the following. The dimension of the row space is 4. The dimension of the null space of A is 2 . The dimension of the left null-space is 4. Every element in the row space is mapped to a unique element in the column space by the linear transformation given by A. The dimension of the null space of A is 4.
The answer is, the correct statement are , 1. The matrix B² is positive definite if A is positive definite. ,2. A square matrix and its transpose have the same set of eigenvectors. , 3. A real square matrix has only real eigenvalues. , 4. The dimension of the row space of a matrix A with rank 4 is 4. , 5. The dimension of the null space of matrix A is 4.
the correct statements from the options provided:
1. The matrix B² is positive definite if A is positive definite.
2. A square matrix and its transpose have the same set of eigenvectors.
3. A real square matrix has only real eigenvalues.
4. The dimension of the row space of a matrix A with rank 4 is 4.
5. The dimension of the null space of matrix A is 4.
Please note that the statements regarding the values of x, dx, v, r, Av, and trace are incomplete or incorrect, so I have not included them in my answer.
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Consider two forces of equal magnitude acting on a point. (a) When the magnitude of the resultant is the sum of the magnitudes of the two forces, make a conjecture about the angle between the forces. (b) When the resultant of the forces is 0, make a conjecture about the angle between the forces. (c) Can the magnitude of the resultant be greater than the sum of the magnitudes of the two forces? Explain.
(a) When the magnitude of the resultant is the sum of the magnitudes of the two forces, the angle between the two forces is 0 degrees or they are acting in the same direction. This is because when two forces act in the same direction, their magnitudes add up to give the magnitude of the resultant force.
(b) When the resultant of the forces is 0, the angle between the forces is 180 degrees or they are acting in opposite directions. This is because when two forces act in opposite directions, their magnitudes cancel each other out and the resultant force is 0.
(c) The magnitude of the resultant can never be greater than the sum of the magnitudes of the two forces. This is because the maximum magnitude of the resultant force is when the two forces are acting in the same direction, which results in the sum of their magnitudes.
When the angle between the forces is greater than 0 degrees, the magnitude of the resultant force will be less than the sum of the magnitudes of the two forces.
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Which of the following algebraic statements are true?
There is at least one true statement. Mark all true statements.
The only true statement is A/B + A/C = 2A/B+C. The correct answer is option 1.
Let's evaluate each statement one by one.
1. A/B + A/C = 2A/B+C. This statement is true. We can solve this by taking the least common multiple of the two denominators (B and C).
Multiplying both sides by BC, we get AC/B + AB/C = 2A. And if we simplify, it becomes A(C+B)/BC = 2A. Since A is not equal to 0, we can divide both sides by A and get: (C+B)/BC = 2/B+C
2. a^2b-c/a^2 = b-c. This statement is false. Let's try to solve this: If we simplify the left side, we get \((a^2b - c)/a^2\). And if we simplify the right side, we get: (b-c). The two expressions are not equal unless c = 0, which is not stated in the original statement. Therefore, this statement is false.
3. \(x^2y - xz/x^2 = xy-z/x\). This statement is also false. Let's try to simplify the left side: \(x^2y - xz/x^2 = x(y - z/x)\). And let's try to simplify the right side: \(xy - z/x = x(y^2 - z)/xy\). The two expressions are not equal unless y = z/x, which is not stated in the original statement. Therefore, this statement is false.
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BONUSES A company has set aside 10 dollars for annual employee bonuses. If the company has 10 employees and the money is divided equally among them, how much will each employee receive?
There are several types of bonuses. Some plans simply give employees a certain share of the company profits. Other programs give incentives to individuals or teams to perform at or above certain thresholds. The following article details 10 types of bonuses that are typically seen in the workplace.
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Answer:
B) 3.0 ml
Step-by-step explanation:
CAN SOMEONE PLZ HELP ME?? PLZ DO YOU KNOW ABOUT Coordinate Planes??!! plzzzzzz help
Answer:
4
Step-by-step explanation:
Line f is 4 units from the x-axis.
smallest positive integer n such that 17^n-n-2 is divisible by 100
we need to find the smallest positive integer n for which the expression 17^n - n - 2 is divisible by 100.
To determine the value of n, we can systematically evaluate the expression for increasing values of n until we find the smallest value that satisfies the divisibility condition. We start with n = 1 and continue incrementing n until we find a value that makes 17^n - n - 2 divisible by 100.
By calculating the expression for different values of n, we can determine the smallest value of n that satisfies the divisibility condition. It involves trial and error, but it can be done efficiently by using modular arithmetic to check divisibility by 100.
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which statement is false about people between the ages of 18 and 25? -Diet and exercise practices tend to improve during this time period.
-Death from disease at this age is rare.
-They go through routine diagnostic tests such as colonoscopies.
-Some people outgrow childhood ailments like asthma at this age.
The false statement is: "They go through routine diagnostic tests such as colonoscopies."
Routine diagnostic tests such as colonoscopies are typically recommended for individuals over the age of 50 as a preventive measure against colon cancer. People between the ages of 18 and 25 are generally not advised to undergo such tests unless they have specific risk factors or symptoms. It is important to note that there may be exceptions in certain cases, but colonoscopies are not typically considered routine for this age group.
On the other hand, the other statements are generally true for people between 18 and 25. Diet and exercise practices tend to improve during this time period as young adults become more conscious of their health and adopt healthier lifestyles. Death from disease is rare at this age due to the overall good health of young adults. Additionally, it is possible for some people to outgrow childhood ailments like asthma as they reach young adulthood, although this varies from person to person.
In summary, while diet and exercise practices tend to improve and death from disease is rare during the ages of 18 to 25, routine diagnostic tests such as colonoscopies are not typically performed during this time period.
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Stephanie started selling earrings online at a handmade shop. She makes a profit of $8.50 on each pair of earrings. If she wants to make a profit of no less than $765 this month, how many pairs of earrings does she need to sell? Write and solve an inequality to model this solution.
Answer:
90 pairs
Step-by-step explanation:
We can use clues from the problem in order to set up our inequality.
First, we know that a pair of earrings, \(p\), costs $8.50. So, we can say that \(8.5p=\) total profit.
That's a function we could use, but we need an inequality. Well, it says that Stephanie wants to make no less, or at least $765. This indicates that we need the 'greater than or equal to' symbol. Just replace the equal sign:
\(8.5p\geq 765\)
Now we can isolate \(p\) to find how many earrings she needs to sell to make a profit of at least $765.
\(8.5p\geq 765\\\\p\geq \frac{765}{8.5}\\\\p\geq 90\)
Stephanie needs to sell at least 90 pairs of earrings.
Hope this helps!
Solve the system of equations. x + y = 15 y = x2 – 5a. (–5, 20) and (4, 11) b. (3, 4) and (7, 8) c. (5, 10) and (–4, 19)d. (5, 20) and (4, 11)
Answer:
a
Step-by-step explanation:
x + y = 15 →→ (1)
y = x² - 5 → (2)
substitute y = x² - 5 into (1)
x + x² - 5 = 15 ( subtract 15 froim both sides and arrange into standard form )
x² + x - 20 = 0 ← in standard form
(x + 5)(x - 4) = 0 ← in factored form
equate each factor to zero and solve for x
x + 5 = 0 ⇒ x = - 5
x - 4 = 0 ⇒x = 4
substitute these value into (2) for corresponding values of y
x = - 5 → y = (- 5)² - 5 = 25 - 5 = 20
x = 4 → y = 4² - 5 = 16 - 5 = 11
solutions are (- 5, 20 ) and (4, 11 )
Combine Like terms:
-6 + y - (-10y)
Answer:
Step-by-step explanation:
-6 + y + 10y
= 11y - 6
Answer:
-6+11y or 11y-6
Explanation:
Since there is a - in front of the parentheses it wants you to multiple by -1, which will be equal to 10y. 10y+y=11y. After this, you would add the -6, or subtract 6 from that.
There are 48 people waiting for a fishing tour. Each boat holds 12 people. Rodney used the work below to find the number of boats needed. Explain how Rodney's work can be used to find the number of boats needed?
Answer:
use division
Step-by-step explanation:
what is the minimum value of the function f(x) = x2 − 10x
Answer:
-25
Step-by-step explanation:
The slope of any line perpendicular to y=1/3x-2
Answer:
-3
Step-by-step explanation:
Opposite of 1/3 is -1/3, the reciprocal of -1/3 is -3
the slope would be -3 or a possible equation could be y=-3x+2 because you do the opposite to the slope when the second line in perpendicular.
Lara chooses a square number.
She rounds it to the nearest hundred.
Her answer is 200
Write all the possible square numbers Lara could have chosen.
The only perfect squares between 150 and 250 that satisfy this condition are 169, 196, and 225, as we found earlier. Therefore, these are the only possible Square numbers that Lara could have chosen.
Lara rounds her chosen square number to the nearest hundred, and the result is 200. This means that her chosen square number must be greater than or equal to 150 and less than or equal to 250.
The first perfect square greater than or equal to 150 is 169, which is 13 squared. The next perfect square is 196, which is 14 squared. The last perfect square less than or equal to 250 is 225, which is 15 squared.
Therefore, Lara could have chosen any of the following three square numbers:
- 169
- 196
- 225
To verify that these are indeed the only possible square numbers that could have been rounded to 200, we can use the formula for rounding to the nearest hundred:
rounded number = 100 * (original number rounded to the nearest hundred)
If the original number is a perfect square, then we can write it as n^2, where n is a positive integer. Substituting this into the formula above, we get:
200 = 100 * (n^2 rounded to the nearest hundred)
Simplifying this expression, we get:
2 = (n^2 rounded to the nearest hundred) / 100
Since the right-hand side is an integer, it follows that n^2 rounded to the nearest hundred must be a multiple of 200. The only perfect squares between 150 and 250 that satisfy this condition are 169, 196, and 225, as we found earlier. Therefore, these are the only possible square numbers that Lara could have chosen.
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A phone company surveys a sample of current customers to determine if they use their phones most often to text or use the Internet. They sort the data by payment plans, as shown below. Plan A: 27 text, 21 Internet Plan B: 13 text, 10 Internet Answer the questions to determine a conditional probability. How many customers are on payment plan B? customers How many of the customers on plan B text? customers What is the probability that a randomly selected customer who is on plan B uses the phone most often to text? Give the answer in fraction form.
Answer:
23 customers on payment plan B
13 customers on plan text B
Probability: 13/23
Step-by-step explanation:
The school cafeteria sells two kinds of wraps: vegetarian and chicken. The vegetarian wrap costs $1.00 and the chicken wrap costs $2.70. Today they made $119.60 from the 72 wraps sold. How many of the wraps sold were vegetarian
Answer:
vegetarians= 28
chickens= 44
Step-by-step explanation:
let the number of vegetarians be x
and chickens be y
So
x+2.7y=119.6----------1
x+y=72--------------2
from 2, x= 72-y
put x= 72-y in 1
72-y+2.7y=119.6
-y+2.7y=119.6-72
1.7y=47.6
divide both sides by 1.7
y=47.6/1.7
y=28
put y=28 in 1
x+28=72
y= 72-28
y=44
Trigonometry Problem
Find the length of the missing side.
Answer:
x= 141.8179
Step-by-step explanation:
side a is 38, side b is 141.8179, side c is 146.8207
angle a is 15 angle b is 90 ancle c is 75