3 years ago

23 girls have a mean height of 153cm

Mathematics

1 answer:

DanielleElmas [232]3 years ago

6 0

Answer:

Mean height of 159

Step-by-step explanation:

Add 153 and 165, then divide by 2 to find the average of 159.

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Which list shows all the factor pairs of 42? A. 1 and 42, 2 and 24, 3 and 18, 4 and 13, 6 and 8 B. 1 and 42, 2 and 21, 3 and 14,

kondor19780726 [428]

Answer:

List B

Step-by-step explanation:

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3 years ago

Rearrange the following equation to solve for the variable indicated. -4x+2Y=8 solve for y

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Answer:

y = 8 + 4x / 2

Step-by-step explanation:

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An isotope decays at a rate of -0.0049% per year. Find the half life. (show the work)

cricket20 [7]

Answer:

14,146 years

Step-by-step explanation:

The annual multiplier is (1 -0.0049%) = 0.999951. We want to find the number of times this needs to be multiplied to make the product 1/2.

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Free_Kalibri [48]

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Y = -9

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No slope because the y - coordinates are the same.

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Is the given function phi(x) = x^2 - x^-1 an explicit solution to the linear equation d^2y/dx^2 - 2/x^2 y = 0? Circle your answe

mart [117]

Answer:

Yes

Step-by-step explanation:

We are given that a function $\phi(x)=x^2-x^{-1}$

We have to find that given function is an explicit solution to the linear equation

$\frac{d^2y}{dx^2}-\frac{2}{x^2}y=0$

If given function is an explicit solution of given linear equation then it satisfied the given differential equation

Differentiate w.r.t x

Then we get $\phi'(x)=2x+x^{-2}$

Again differentiate w.r.t x

Then we get

$\phi''(x)=2-\frac{2}{x^3}$

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= $2-\frac{2}{x^3}-2+\frac{2}{x^3}=0$

Hence, given function is an explicit solution of given differential equation.

Therefore, answer is yes.

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3 years ago