Anne is currently h years old. bill is currently 2h years old and charles is currently 8 years old finally an expression for each persons age after h years then find an expression for the sum of their ages after h years

 30 × 68 × 28 . 5 cubic inches - the Hawks' refrigerator
 ( 30 × 68 × 28 . 5 ) + 16 cubic inches the Lopezes' refrigerator

We can see that difference between these to volumes that in the Lopezes' refrigerator is (+16),
that means that  the Lopezes' refrigerator has by 16 inch³ greater volume than Hawks' refrigerator, or  the Hawks' refrigerator has by 16 inch³ less volume than the Lopezes' refrigerator.

D.
The volume of the Hawks' refrigerator is 16 cubic inches less than the volume of the Lopezes' refrigerator