Find the difference of 6/1 over 4 and 4/7 over 12

Which of the fallowing best completes the sequence 5,10,15, a) 30 b) 22 c)25 d)35

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.]

What is the base of 1/9 to the power of 2