If c | | d, which statement must be true? A. <1 ≈ <16
B. <7 ≈ <10
C. M<14 + M<15 = 180°
D. M<6 + M<10 = 180°

D. M<6 + M<10 = 180°

Step-by-step explanation:

Because they are consequetive interior angles and they are supplementary

17

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).