Does anyone know the answer?

Given f(x) = 17-x^2what is the average rate of change in f(x) over the interval [1, 5]?

Mr switzer needs to buy new 1-foot tiles to cover his bathroom floor. the floor is 12 feet long and 8 feet wide. each square foot of tile will cost $1.79. in dollars what will be the total cost of the tiles he needs to buy.

Abus travels 36 miles in 45 minutes. enter the number of miles the bus travels in 60 minutes at this rate.