What is 22.5% written as a mixed number

If square root x = -7, then x= -49 true or false

Louis wants to carpet the rectangular floor of his basement. the basement has an area of 864 square feet. the width of the basement is 2/3 it's length. what is the length of louis's basement

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.