Volume: A spherical balloon is being inflated with air. The radius R, in inches, of the balloon is a function of the volume V , in cubic inches, of air in the balloon. The formula is The volume V is a...

Volume: A spherical balloon is being inflated with air. The radius R, in inches, of the balloon is a function of the volume V , in cubic inches, of air in the balloon. The formula is

The volume V is a function of time t, in seconds, and the formula is

V = 1.5 + 0.1t .

a. Use function composition to find a formula for R as a function of t.

b. What is the radius at time t = 2 seconds?