My sister is 16 years old. My brother says that his age minus nighteen is equal to my sister's age. How old is my brother? Write a equation with b as variable

A heptagon is a seven-sided polygon. It is also sometimes called a septagon, though this usage mixes a Latin prefix sept- (derived from septua-, meaning "seven") with the Greek suffix -gon (from gonia, meaning "angle"), and is therefore not recommended.

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The perimeter of the rectangular lot =  326 units

In this question we have been given that Alana's house sits on a rectangular lot with the dimensions 63 by 100.

We need to find the perimeter.

From given dimensions:

the length of the rectangular lot is 100 units and the width of the rectangular lot is 63 units

We know that the perimeter of rectangle is:

P = 2 (length + width)

so, for l = 100 and w = 63 the perimeter would be,

P =  2 * (100 + 63)

P = 2 * 163

P = 326 units

So, the perimeter = 326 units

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Answer:

-116.96256

Step-by-step explanation:

(-9.088) x (12.87)

(use the rules for multiplication)

-(9.088 x 12.87)

(multiply)

-116.96256

(your answer)

If a pollster wishes to estimate the number of left-handed scientists. The sample that is needed in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 4% is: 176.71.

Using this formula to find the sample

n =Z²π (1-π) ÷ e²

Where:

n =sample size =?

Z =  Z -score for 95% confidence level =1.960

π = Population proportion = 0.08

e = Margin of error = 0.04

Let plug in the formula

n = 1.96² × 0.08 × (1 - 0.08) ÷ 0.04²

n =  3.8416× 0.08 × 0.92 ÷ 0.0016

n = 176.71

Therefore the sample is 176.71.

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Answer:

radicand

Step-by-step explanation:

The source, format, assumptions and constraints, and other facts concerning certain data are collectively called 'metadata'.

Metadata provides information about data that helps users understand and use it effectively.

Some examples of metadata include,

The date and time the data was collected.

The file format of the data.

The units of measurement used.

And any assumptions or limitations that were made during the collection or analysis of the data.

By providing metadata along with the data, users can better understand the context and quality of the data.

This can help them make more accurate and informed decisions.

Metadata is classified into three types which are known as descriptive, administrative, and structural.

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To find the two numbers given the provided information, we can set up a system of equations. Let's denote the first number as x and the second number as y. Based on the given information, we can establish two equations: x + y = 18 and (4/7)y - 5x = 14. By solving this system of equations, we can determine the values of x and y.

The first equation states that the sum of the two numbers is 18. This equation represents the relationship between x and y. The second equation relates the two numbers through a specific expression. It states that when five times the first number is subtracted from four-sevenths of the second number, the result is 14. By solving the system of equations, we can find the values of x and y that satisfy both equations simultaneously, giving us the solution for the numbers.

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Answer:

what's your questions

Answer:

i think it's wednesday and good luck:)!

Answer:

the answer is a percent                                      

Answer:

A percent!

Step-by-step explanation:

50/100 is 50%

Answer:

The answer is 15.4

Step-by-step explanation:

hope this helps

1.3 + 12 =13.3+2.1=15.4

So, Lana gave away 26.32% of he Pokemon cards  to her little brother.

To find the percentage of cards Lana gave away, we can use the formula:(Quantity given away / Total quantity) * 100.

In this case, Lana gave away 125 cards out of her total collection of 475 cards.Plugging these values into the formula, we have:

(125 / 475) * 100 = 0.2632 * 100 = 26.32%.

Lana gave away 26.32% of her Pokemon cards to her little brother.

Alternatively, we can calculate the percentage by subtracting the remaining cards from the total and finding the ratio:

Percentage given away

= (Cards given away / Total cards) * 100

= (125 / 475) * 100

= 26.32%.

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32 papers would Ashley have to remain to grade after working for 6 hours.

What is simplification?

Simplifying procedures is one way to achieve uniformity in work efforts, expenses, and time. It reduces diversity and variety that is pointless, harmful, or unnecessary.

Here, we have

Ashley is a teacher and takes home 98 papers to grade over the weekend.

She can grade at a rate of 11 papers per hour.

We have to calculate how many papers would Ashley has remaining to grade after working for 6 hours.

Based on the given conditions, formulate:: 98 - 11 × 6

Calculate the product or quotient: 98 - 66

Calculate the sum or difference: 32

Hence, 32 papers would Ashley have to remain for a grade after working for 6 hours.

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Answer:

yes, 2 gallons

Step-by-step explanation:

Answer:

i think your right

Step-by-step explanation:

The given costs are : Cost of pen = $1.85Cost of marker = $0.47 less than a pen

Cost of marker = $1.85 - $0.47 = $1.38Cost of 2 pens and a marker= 2($1.85) + $1.38 = $3.72 + $1.38 = $5.10

If Jon gives a ten-dollar bill, then he gets a change of $10 - $5.10 = $4.90

Thus, Jon will get $4.90 change from a ten-dollar bill.

Pens are more harmful to the environment than pencils. Pens are always ready to write, whereas pencils need to be sharpened. A pencil becomes harder to use and shorter the more you sharpen it. Pencils cannot be used to write on skin. Ballpoint pens are one of the most common and well-known kinds of pens.

Ballpoint pens use an oil-based ink that dries more quickly than other types of ink. When you write, you'll notice less smudging as a result. Since the ink is thick, ballpoint pens utilize less ink as you compose, enduring longer than other pen types.

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Answer:

Circumference of circle : 2πr

= 2 × π × 14

= 28 π ft

If you need any other help , please let me know ! ,[ you'll have to pay ]

Answer: d

Step-by-step explanation:

In order to know if a triangle is a right triangle on a coordinate plane, you can find the lengths of all three sides of the triangle using the distance formula and apply the Pythagorean theorem.

Find the lengths of the three sides of the triangle using the distance formula.

Once you have the lengths of the sides, check if any of the three sides satisfy the Pythagorean theorem, which states that in a right triangle, the square of the length of the hypotenuse (the longest side) is equal to the sum of the squares of the other two sides. In other words, if a² + b² = c², where c is the longest side, then the triangle is a right triangle.

If one of the sides satisfies the Pythagorean theorem, then the triangle is a right triangle.

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Answer:

Step-by-step explanation:

you have to substitute x with -3, so where you see x in the equation you write a -3 and calculate

\(\frac{(x-2)(x+9)}{x(x+5)} = \frac{(-3-2)(-3+9)}{-3(-3+5)} = \frac{-5*6}{-3*2} =\frac{-5}{-1} =5\)

Answer:

the answer should be 27 you jus add them up

Step-by-step explanation:

just add them up and you get 27

Answer:

its option B

Step-by-step explanation:

Answer:

the answer is d

Step-by-step explanation:

The probability of A given B is 0, and P(A | B) is not equal to P(A). Events A and B are mutually exclusive, meaning that they cannot both occur at the same time, and thus they are not independent. Mutually exclusive events are not necessarily independent and independent events may or may not be mutually exclusive.

P(A) = 0.30 and P(B) = 0.40, so P(A and B) = 0 because the events A and B are mutually exclusive. This means that the probability of A given B is 0, and P(A | B) = 0. P(A | B) is not equal to P(A).Events A and B are mutually exclusive, meaning that they cannot both occur at the same time, and thus they are not independent.The statement that mutually exclusive events and independent events are the same is not accurate. Mutually exclusive events are not necessarily independent and vice versa.Given the results of this problem, we can conclude that mutually exclusive events are not independent, and independent events may or may not be mutually exclusive. The two concepts are not necessarily related as mutually exclusive events do not necessarily need to be independent and independent events do not necessarily need to be mutually exclusive.

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The forecasts generated using the four-period simple moving average method would likely not perform well in a scenario where sales have been consistently decreasing by 10 every period.

The simple moving average method calculates the average of a specified number of periods, in this case, four periods. However, the method does not consider the direction or trend of the data points. It assumes that the historical data points are equally important and equally weighted in forecasting future values.

In a scenario where sales are consistently declining, using a moving average will not capture the downward trend effectively. The method will give equal weight to the previous periods, including those when sales were higher. Consequently, the forecasts generated by the four-period simple moving average will not accurately reflect the decreasing sales pattern.

To achieve more accurate forecasts in a situation of consistently decreasing sales, alternative forecasting methods that consider trends, such as exponential smoothing or trend analysis, would be more appropriate. These methods give more weight to recent data points and take into account the trend in the data, allowing for better predictions in scenarios with a clear trend.

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Answer:

Step-by-step explanation:

Solution : Given that, n = 363 x = 171 = x / n =171 / 363 = 0.471 1 - = 1 - 0.471 = 0.529

The graph is shown in the attached image.

9/10 mile = 5 min

9/10 ÷ 5 mile = 1 min

9/10 × 1/5 mile = 1 min

9/50 mile = 1 min

the null hypothesis for the given t-test\(`[h, p, 0] = ttest(morningsections, eveningsection)`\)

In the t-test formula for hypothesis testing, the null hypothesis states that there is no difference between the two groups being tested. Therefore, for the given t-test below:

`[h, p, 0] = ttest(morningsections, eveningsection)`,

the null hypothesis is that there is no significant difference between the average bedtimes of students in morning sections versus evening sections.

To explain further, a t-test is a type of statistical test used to determine if there is a significant difference between the means of two groups. The formula for a t-test takes into account the sample size, means, and standard deviations of the two groups being tested. It then calculates a t-score, which is compared to a critical value in order to determine if the difference between the two groups is statistically significant.

In this case, the two groups being tested are morning sections and evening sections, and the variable being measured is the average bedtime of students in each group. The null hypothesis assumes that there is no significant difference between the two groups, meaning that the average bedtime of students in morning sections is not significantly different from the average bedtime of students in evening sections.

The alternative hypothesis, in this case, would be that there is a significant difference between the two groups, meaning that the average bedtime of students in morning sections is significantly different from the average bedtime of students in evening sections. This would be reflected in the t-score obtained from the t-test, which would be compared to the critical value to determine if the null hypothesis can be rejected or not.

In conclusion, the null hypothesis for the given t-test\(`[h, p, 0] = ttest(morningsections, eveningsection)`\) is that there is no significant difference between the average bedtimes of students in morning sections versus evening sections.

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Answer:

-13

Step-by-step explanation:

f(x)=2x-7

f(-3)=2(-3)-7=-6-7=-13