If 6 pounds of grapes costs $1.89, how much would 15 pounds of grapes cost?

Find the average rate of change for f(x) = x2 − 3x − 10 from x = −5 to x = 10.

Can someone check my answer? you : )

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.