216=r^3

what is r? how do you isolate the r and get rid of the cubed aswell?

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)

Write the equation of the circle centered at (10,-2) with radius 2.