The comic books in Cora’s favorite series regularly cost $2.99. Today, they are on sale for $0.50 off the regular price.

Cora subtracts $0.50 from $2.99 and multiplies the result by 4 to find the cost of 4 comic books at the sale price.

Write a numerical expression to express the calculation. Do not simplify the expression.

what

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).

=

x=0.8898305 is the answer to that equation