Which is better buy 12 binders for $30 or 7 binders for $16.80

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 larger of two number is 4 less than twice the smaller number. the sum is 41. find the numbers

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way