Find the length of HK

Mary works for a company that ships packages and must measure the size of each box that needs to be shipped. mary measures a box and finds the length is 7 inches, the width is 14 inches, and the height is 15 inches. what is the volume of the box? [type your answer as a number.]

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

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