SOLUTION: Please, help me with this Suppose the radius of a circle is 3cm at a certain instant and it is increasing at the rate of 0.5cm/sec, at what rate will the area be increasing at the

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: Please, help me with this Suppose the radius of a circle is 3cm at a certain instant and it is increasing at the rate of 0.5cm/sec, at what rate will the area be increasing at the      Log On


   

Question 1027860: Please, help me with this
Suppose the radius of a circle is 3cm at a certain instant and it is increasing at the rate of 0.5cm/sec, at what rate will the area be increasing at the instant?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
A+=+pi%2Ar%5E2 ==> dA%2Fdt+=+2%2Api%2Ar%2A%28dr%2Fdt%29
==> dA%2Fdt+=+2%2Api%2A3%2A0.5+=+3pi sq.cm/sec.