Solve for x in the equation x squared + 20 x + 100 = 36. x = –16 or x = –4
x = –10
x = –8
x = 4 or x = 16

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).

60: 45 =12: 9 =4: 3 so the answer is 4: 3

the first domain and range set to the left is matched with the top relation, and the second set the set in the middle goes with the bottom relation.