Asked by Aaqib zaman

The radius, r cm , of a spherical balloon at a time t seconds is given by
r = 3 + 2 / (1+t)


What is the initial radius? Find the rate of change of r (w.r.t.t) when t=3

Answers

Answered by Steve
I'll do one, just for grins.

if you're taking calculus, you should surely be able to do

r = 3+2/(1+0)

to get the radius when t=0!

Having mastered the arcane art of plugging in a value, and knowing that

dr/dt = -2/(1+t)^2

you can probably figure what dr/dt is when t=3.
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