H: the area of a circle is 4 square centimeters. what is the circumference?

The radical equation 2+√2x-3 = √x+7 has a solution set [x= a0} and an extraneous root x = a1.

At a sale this week, a desk is being sold for $213. this is a 29% discount from the original price. what is the original price?

If the simple annual interest rate on a loan is 6, what is the interest rate in percentage per month?