Hmm...this is difficult. The first thing I can think of is the relationship between age and time.
Calculate the volume of both the prism and the cubes:
Prism:
Volume = 20 x 2 x 3.25 = 130 cubic inches.
Volume of cube:
Volume = S^3 = 1/4^3 = 1/64 ( 0.015625)
Divide the area of the prism by the area of the cube:
130 / 1/64 = 130 * 64 = 8,320
It would take 8,320 cubes to fill the prism.
Yeah that's right I'm pretty sure that's the work u do so u r not wrong ok so relax
Perimeter means finding the total area of the outside of the triange (so the sum of all sides).
If you need further help, let me know!