You want to pass a 13 m long irrigation pipe through the middle of a wheat crop, and it is known that the length of the cultivated section is 7 m more than the width, what are the dimensions of the cultivated section? Please help me... thanks

the answer to this question is in the pic

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).

the answer to your question is b.