can someone help me with this question it's due today and I've tried what I could but couldn't figure out the answer.​

The hypotenuse of a 45 -45 -90 triangle measure 7 square root 2 units

The graph below shows the amount of money left in the school’s desk fund, f, after d desks have been purchased. for each new desk that is purchased, by how much does the amount of money left in the school’s desk fund decrease?

Given the graphed function below which of the following orders pairs are found on the inverse function