Which statements about this prism partially packed with unit cubes are true? Check all that apply.
The middle layer of cubes is missing 7 unit cubes
There are 9 unit cubes stacked in the prism.
There are 7 unit cubes that are hidden from view inside the prism.
The volume of the prism can be found by 12x3 because there are 12 cubes in each layer and there are 3 layers of cubes.
The volume of the prism can be found by doubling the number of cubes in the prism because it is half full.

x=30

step-by-step explanation:

b

step-by-step explanation:

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).