I think of a number add 7 and the results is 15

What signals you that factoring by grouping is the best method to use when factoring a problem?

Find the area of a parallelogram with base 15 yards and height 21 2/3

Af jewelry box is in the shape of a rectangular prism with an area of 528 cube inches. the length of the box is 12 inches and the height is 5 1/2 inches. what is the width of the jewelry box