The formula is 2(wl+hl+hw) to calculate surface area fo a rectangular prism.
31 x 7.875 = 244.125
244.125 inches altogether
I’m pretty sure it would be 1/5, because scaling is changing the y values of the function. If the y value of the original is 10, you need to multiply/scale the new one by 1/5 to get the y value of 2
The answer is this: $3.60
4 x 10 = 40 - 0.4 = 3.6
