anonymous
  • anonymous
I am asked to find the change of A with respect to r, when r=4 the problem reads: A=2700[1+(r/1200)]^96 The available choices are: A) dA/dr= 297.3 B) dA/dr= 216.72 C) dA/dr= 217.44 D) dA/dr= 296.31 I don't understand how to do this even after substituting 4 for the r
Calculus1
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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welshfella
  • welshfella
what do you get for dA/dr ?
anonymous
  • anonymous
Use a order of operation. PEMDAS First to do is the paratheis
welshfella
  • welshfella
you need to find the derivative of A

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anonymous
  • anonymous
How do I find a derivative of something with no variable?
welshfella
  • welshfella
the variable is r
anonymous
  • anonymous
(1.003)^96=96.288 96.288*2700=259977.6
anonymous
  • anonymous
yes the variable is r, and r is 4
welshfella
  • welshfella
that's not the way to do this you need to find a rate of change so you differentiate
welshfella
  • welshfella
You are working out A not dA/dr
anonymous
  • anonymous
how would I work our dA/dr?
welshfella
  • welshfella
dA / dr = 2700* 96(1 + r/1200)^95 * 1/1200
welshfella
  • welshfella
- use the chain rule
welshfella
  • welshfella
so plug in r = 4 and you have your answer
welshfella
  • welshfella
You'll need a calculator for that , of course
anonymous
  • anonymous
259200?
welshfella
  • welshfella
No
welshfella
  • welshfella
It comes to one of the choices
welshfella
  • welshfella
If you have a graphical calculator you can just type it in as above otherwise it might be better to work out the parentheses first then the exponential (^95), then multiply by 2700 , by 96 and then divide by 1200
anonymous
  • anonymous
Wow, I have no idea how you figured out how to do it like that, but it works. I will be thinking about this one all day. Thanks
welshfella
  • welshfella
the derivative dA/dr gives you the rate of change of area with respect to r. by plugging in r = 4 you get the rate of change when r = 4.

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