How many inch cubes can fit into an empty box with a volume of 2 cubic feet?

Even though it's 2 cubic 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!

Num of plants = (original#ofplants)*(1.6)^t