Can someone help me with these two questions?

the answer is 31.27mph

the answer is 1030 it's very simple math.

step-by-step explanation:

for volume, add base x height x width

answer: hence, function will be

explanation:

since we have given that

cost of a new textbook = $85

according to question, the resale value of a textbook decreases by 25% with each previous owner,

so, our function becomes,

here, y is the total value of the text book after x owners.

hence, function will be