What would you have to do to change 10 cubic feet into cubic inches?                 a.  multiply by 1,728      b.  multiply by 46,656      c.  divide by 1,728      d.  divide by 46,656 

1 ft = 12 inches
(1 ft)^3 = (12 inches)^3
1 cubic foot = 1728 cubic inches

You'll multiply by the conversion factor (1278 in^3)/(1 ft^3) to convert from cubic feet to cubic inches. Notice how the cubic feet ft^3 unit is at the bottom of the conversion fraction, so that the cubic feet units cancel.

A) multiply by 1728

That’d be 9 years or something