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4 years ago

Please help me answer this math question!

Mathematics

1 answer:

Sveta_85 [38]4 years ago

5 0

The answer is B. If you would like an explanation just comment.

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If y=3/x then y'=? A)-y/x B)y/x C)-x/y D)-3x/y E)-y/3x

Marina86 [1]

$y=\dfrac{3}{x}\\\\\\
y'=\left(\dfrac{3}{x}\right)'=(3\cdot x^{-1})'=3\cdot(x^{-1})'=3\cdot(-1)\cdot x^{-2}=-3\cdot x^{-2}=\\\\\\=-\dfrac{3}{x^2}=-\dfrac{3}{x\cdot x}=-\dfrac{3}{x}\cdot\dfrac{1}{x}=-y\cdot\dfrac{1}{x}=-\dfrac{y}{x}$

Answer (A)

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3 years ago

PLEASE HELP ME W/ THESE QUESTIONS! THANKS

Brilliant_brown [7]

See im only in the *th grade i have not learned that yet but soon will come maybe when it comes i can get u too help me ?

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3 years ago

4. A study found that the average time it took a person to find a new job was 5.9 months. If

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4 years ago

Simplify each equation. Tell whether the equation has one, no, or infinite solutions.

ANEK [815]

Answer:

-7 = -7

a. infinite solution

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3 years ago

An article suggests the uniform distribution on the interval (7.5, 19) as a model for depth (cm) of the bioturbation layer in se

mamaluj [8]

Answer:

a) Mean: 13.25

Variance: 11.02

0 if x below than 7.5

${x-a}{b-a}$ is x in between 7.5 and 19

1 if x higher than 19.

Step-by-step explanation:

This is a problem in which we use the uniform probability distribution.

(a) What are the mean and variance of depth?

The mean is the midpoint of 7.5 and 19. So

$M = \frac{7.5 + 19}{2} = 13.25$

The mean is 13.25

The variance is given by the following formula:

$V = \frac{(b-a)^{2}}{12}$

In which b and a are the limits of the interval. So $b = 19, a = 7.5$

$V = \frac{(b-a)^{2}}{12} = \frac{(19-7.5)^{2}}{12} = 11.02$

The variance is 11.02.

(b) What is the cdf of depth?

The uniform probability distribution has a cummulative distribution function, of 0 if is below a, $\frac{x-a}{b-a}$ for x in between a and b and 1 is x is greater than b.

So:

0 if x below than 7.5

${x-a}{b-a}$ is x in between 7.5 and 19

1 if x higher than 19.

6 0

4 years ago