Wednesday

December 17, 2014

December 17, 2014

Posted by **Julie** on Sunday, February 10, 2013 at 9:54pm.

(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.

- Precalculus (Please Help!!??) -
**Steve**, Monday, February 11, 2013 at 5:05am(h) since x^3 is always increasing, there are no two values of x that give the same y. So, x^3 has an inverse

(b) not so for x^2, since there are two values of x for each y. If you restrict the radius to positive values, though, then x^2 has an inverse. Makes sense, since a negative radius makes no physical sense.

**Answer this Question**

**Related Questions**

MATH - The formula for the area of a circle and the volume of a sphere an be ...

Applied Programming - APPLIED PROGRAMMING (APR520S) ASSIGNMENT 1 Problem Solving...

math - The earth has a radius of 6,380 km. The formula for the volume of a ...

Precalculus - The sphereflake shown (not shown for question) is a ...

GEOMETRY(CIRCLE) - Three circles with different radii have their centers on a ...

10th grade - The volume of a small sphere is 36 pie cm cubed. The volume of a ...

surface area and volume - I really need some help, I don't fully understand. ...

Spheres, Locus (in space aka 3d) - 1) A "small circle" is a circle on a sphere ...

8th grade math - circle A has a raduis that is twice the length og the raduis of...

marh - The radii of two circles are in the ratio of 3 to 1. Find the area of the...