Answer: the answer is D
Step-by-step explanation:V = pi (d/2)^2 * h
V = pi (d^2 / 4) * h
h = 4V / ( pi * d^2) (meters)
By the chain rule,

which follows from
.
is then a function of
; denote this function by
. Then by the product rule,
![\dfrac{\mathrm d^2y}{\mathrm dx^2}=\dfrac{\mathrm d}{\mathrm dx}\left[\dfrac1x\dfrac{\mathrm dy}{\mathrm dt}\right]=-\dfrac1{x^2}\dfrac{\mathrm dy}{\mathrm dt}+\dfrac1x\dfrac{\mathrm df}{\mathrm dx}](https://tex.z-dn.net/?f=%5Cdfrac%7B%5Cmathrm%20d%5E2y%7D%7B%5Cmathrm%20dx%5E2%7D%3D%5Cdfrac%7B%5Cmathrm%20d%7D%7B%5Cmathrm%20dx%7D%5Cleft%5B%5Cdfrac1x%5Cdfrac%7B%5Cmathrm%20dy%7D%7B%5Cmathrm%20dt%7D%5Cright%5D%3D-%5Cdfrac1%7Bx%5E2%7D%5Cdfrac%7B%5Cmathrm%20dy%7D%7B%5Cmathrm%20dt%7D%2B%5Cdfrac1x%5Cdfrac%7B%5Cmathrm%20df%7D%7B%5Cmathrm%20dx%7D)
and by the chain rule,

so that

Then the ODE in terms of
is

The characteristic equation

has two roots at
and
, so the characteristic solution is

Solving in terms of
gives

Answer:
The final cost for him is;

Explanation:
Given that the ipod costs $220;

The store gives a 35% discount, which means he will only pay 65% of the original cost;

The store price is;

Also he will need to pay additional 8% sales tax on the discounted price P;

The final cost he need to pay is the sum of the discounted price and the sales tax;

Therefore, the final cost for him is;
2436 + 13 = 2449. you would count up 13 from 2436, or using the way I do it, since there are to digits in 13, and the 1 is in the second digit, add 1 to the second digit of 2436, so the 3. this makes 4 in that place. then all you have left is to add 3 to 6, making 9. so you are left with 2449. Plz plz plz give me brainiest answer I only need 4 more to rank up. If u do I will show my work.