# MATH

posted by
**Julie**
.

The formula for the area of a circle and the volume of a sphere an be though of as functions of the radii of the shapes.

(Anything you could answer would be so helpful) Thank you!!

a) Write a rule expressing the area of a circle as a function of its radius. What is the domain of this function? Sketch a graph.

b) does this function have an inverse? If so, write a rule for the inverse.

C) Explain why it makes sense that the radius of a circle should be a function of its area. In what contexts would this function be useful?

d) Does the function f(x)πx^2, where x is any real number, have an inverse? Compare your answer to that in part b. Explain any differences.

e) Now write a rule expressing the volume of a sphere as a function of its radius. What is the domain of this function? sketch a graph.

f) Does this function have an inverse function? If so, write a rule for the inverse function.

g) Explain why it makes sense that the radius of a sphere should be a function of its volume. In what contexts would this function be useful?

h) Does the function g(x)=4/3πx^3,where x is any real number, have an inverse? Compare your answer to that in part f. Explain any differences.