Use exact numbers

Find the equation of the line

Thank very much in advance!

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Elizabeth claims that the fourth root of 2 can be expressed as 2^m since (2^m)^n = 2. find the values of m and n for the case where elizabeth's claim is true.

What is the ordered pair of m’ after point m (5, 6) is rotated 90° counterclockwise?