The width of a rectangle whose perimeter is 28 cm, if the width is 3 cm less than the length

Asquare picture with sides of 32 inches is to be mounted on a square mat with sides of 52 inches. find the area of the mat that will remain uncovered by the picture.

Write the expression 7x^3-28xy^2 as the product of 3 factors

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.