Simplify the expression 2x+1+7x

9x+1

Step-by-step explanation:

=2x + 1 + 7x

=2x +7x+1

=9x+1

(hope this helps)

i'm pretty sure it's 477,585,296, but perhaps my math is incorrect.

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).