What’s the answer really need help

A) 1.5

Step-by-step explanation:

You see, the slope is defined by y_2-y_1/x_2-x_1 so therefore if we look at 3 gallons of water and 4 gallons of water the y is length of string and x is water(gallons) so it's (4.5-3)/4-3=1.5/1= 1.5

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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).