Rosa ordered 3pizzas she paid $21.75 after using a $5 off coupon. write an equation that can be used to find the regular price of a pizza

21.75+5=26.75

Step-by-step explanation:you add the five dollars taken away and you have your answer

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).