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3 years ago

11

Mr. Mendez ran 13.1 miles at a constant rate for 150 minutes.To find how he ran,you solve the equation 13.1=x•150.What does x re

present?

1 answer:

Tatiana [17]3 years ago

7 0

Answer:

His speed in miles per minute

Step-by-step explanation:

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El equipo mixto de fútbol tiene cuatro veces más niños que niñas. Decimos quela razón del número de niños

makvit [3.9K]

Answer:

4 a 1

Step-by-step explanation:

Se lee "4 a 1"

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3 years ago

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What is f(-3) for the<br> function f(a)=-2a?-5a+4?

Olegator [25]

Answer:

13

Step-by-step explanation:

f(-3)=2(-3)-5(-3)+4. = -6+15+4= 13. f(a)=13

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2 years ago

A random sample of 31 charge sales showed a sample standard deviation of $50. a 90% confidence interval estimate of the populati

Marysya12 [62]

The $100(1-\alpha)\%$ confidence interval of a standard deviation is given by:

$\sqrt{ \frac{(n-1)s^2}{\chi^2_{1- \frac{\alpha}{2} } }} \leq\sigma\leq\sqrt{ \frac{(n-1)s^2}{\chi^2_{\frac{\alpha}{2} } }}$

Given a sample size of 31 charge sales, the degree of freedom is 30 and for 90% confidence interval,

$\chi^2_{1- \frac{\alpha}{2} }=43.773 \\ \\ \chi^2_{\frac{\alpha}{2} }=18.493$

Therefore, the 90% confidence interval for the standard deviation is given by

$\sqrt{ \frac{(31-1)50^2}{43.773 }} \leq\sigma\leq\sqrt{ \frac{(31-1)50^2}{18.493 }} \\ \\ \Rightarrow\sqrt{ \frac{(30)2500}{43.773 }} \leq\sigma\leq\sqrt{ \frac{(30)2500}{18.493 }} \\ \\ \Rightarrow\sqrt{ \frac{75000}{43.773 }} \leq\sigma\leq\sqrt{ \frac{75000}{18.493 }} \\ \\ \Rightarrow \sqrt{1713.38} \leq\sigma\leq \sqrt{4055.59} \\ \\ \Rightarrow41.4\leq\sigma\leq63.7$

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3 years ago

The equation of the line of best fit of a scatter plot is y = –7x – 2. What is the the y-intercept? (4 points)

slava [35]

-2

I just took this class for Algebra 1... it would be -2

y=mx+b

this is the equation you will use for these problems. the "b" in the equation represents the y intercept. In this specific problem -2 is the y intercept

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3 years ago

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If m∠ADC = 164° and is the angle bisector of ∠ADC, find

zhuklara [117]

Answer: 82

Step-by-step explanation:

We know that ADC is the angle bisector

So BDC and BDA are two equal angles

So 164 divided by the two equal sides gives us 82 on each side

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2 years ago