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2 years ago

Edgar ran eee meters per second, and Mathieu ran mmm meters per second. The boys ran for ttt seconds.

Mathematics

2 answers:

Oksana_A [137]2 years ago

7 0

Answer:

The expression showing how many more meters Mathieu ran than Edgar ran during that time is $t(m-e)$ .

Step-by-step explanation:

Edgar ran 'e' meters per second, and Mathieu ran 'm' meters per second. The boys ran for 't' seconds.

The expression $t(m-e)$ describes how many more meters Mathieu ran than Edgar ran during that time.

We can also use the expression $tm-te$ represent the same quantity.

We know that,

$\text{Distance} =\text{Speed}\times \text{Time}$

Distance covered by Edgar = te

Distance covered by Mathieu = tm

Difference in distance $d= tm - te=t(m-e)$

The expression showing how many more meters Mathieu ran than Edgar ran during that time is $t(m-e)$ .

Sveta_85 [38]2 years ago

4 0

Answer:

TE, then tm, then m-e, then t

Step-by-step explanation:

I got it right on khan academy

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For this case the 95% confidence interval is given (63.5 , 74.4) and we want to conclude about the result. For this case we can say that the true mean of heights for male students would be between 63.5 and 74.4. And the best answer would be:

b. The doctor can be 95% confident that the mean height of male students at the college is between 63.5 inches and 74.4 inches.

Step-by-step explanation:

Notation

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

s represent the sample standard deviation

n represent the sample size

Solution to the problem

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

In order to calculate the mean and the sample deviation we can use the following formulas:

$\bar X= \sum_{i=1}^n \frac{x_i}{n}$ (2)

$s=\sqrt{\frac{\sum_{i=1}^n (x_i-\bar X)}{n-1}}$ (3)

In order to calculate the critical value $t_{\alpha/2}$ we need to find first the degrees of freedom, given by:

$df=n-1=40-1=39$

b. The doctor can be 95% confident that the mean height of male students at the college is between 63.5 inches and 74.4 inches.

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2 years ago

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Dvinal [7]

Answer:

A is the answer.

Step-by-step explanation:

A fraction plus a fraction is equal to a fraction. An irrational number cannot be expressed as a fraction.

0.3333333 even though it looks like an irrational number it is actually: 1/3

3/5 is already a fraction so adding it with another fraction will NOT equal an irrational number (decimal)

-0.75 is equal to -3/4 (75/100 => 3/4). Same thing that applies above.

However, Pi cannot be expressed as a fraction exactly. You can round up like 3.14. However it is not the full number. So 3.141592654....+(3/4) is not going to add up perfectly into a fraction.

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Answer:

Step-by-step explanation:

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injured runners train on a special track at a rehabilitation center. The track is a square with a half circle on its left and ri

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Answer:

The length of the track is approximately 51.7 ft

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Step-by-step explanation:

The given track shape and measurements are;

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The perimeter of the track, which is the length of the track is made up of the three sides of the square opposite to the half circle and the circumference of the half circle.

Therefore;

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