Answer: I believe you are correct I got the same answer as you.
Answer:
don't ask for an explanation. your answer is below.
Step-by-step explanation:

Let x be the speed.
Maximum is 65 so x needs to be less than or equal to 65.
The minimum is 45, so x also has to be greater than or equal to 45
45 <= x => 65
M is the slope.
B is the y-intercept
The constant of proportionality is the ratio between two directly proportional quantities.
Answer:
It would be 14 because since each book is 3.5cm thick times that by 4 and get 14.