1.5 * 8/5 = 0.3*8 = 2.4
2.5 * 8/5 = 0.5*8 = 4.0
Even though it's 2 <em>cubic</em> feet, it doesn't matter. It still can be transformed into inches.
1 foot = 12 inches
Multiply the 2 feet by 12 which should be:
12×2=24
So 24 cubic inches can be fit into a empty box with a volume of 2 cubic feet.
Hope this helps!
By graphing it, oddly enough... you can just make a table of values and graph that, bear in mind that a LINEAR function is just a LINE, and to graph a line, all you need is two points. *Unless you have a specific function in mind.