do you mind helping me out on this last one as well?

The radius of a circle is initially at 10 ft. It increases at a rate of 30 ft/hr. Calculate how fast the are of the circle is changing at a radius of 100 ft. And what rate is the area at 2 hrs.

Question

do you mind helping me out on this last one as well?

The radius of a circle is initially at 10 ft. It increases at a rate of 30 ft/hr. Calculate how fast the are of the circle is changing at a radius of 100 ft. And what rate is the area at 2 hrs.

anonymous · Answer

i think this is the answer so rate of change in the radious i r = 10 + 30*h, so rate of change in area is A =pi*r^2. plug in your valuse and solve

anonymous · Answer

thank you im going to try that out. When i did it out i got 6000 pi. is that correct for the first part?

anonymous · Answer

that is a big number it could be wrong

anonymous · Answer

hmmm :/ ill do it again

anonymous · Answer

i hope other people also look at this question. i have not done this stuff since grade 10 or 11. am a bit rusty at it

anonymous · Answer

yea me too, it urks me becase i really want to know! it will bother me ill keep on trying

anonymous · Answer

Thank you for the help it helped alot