How do I do this?

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

Answer this 30 points and brainliest!

Data was collected on myrtle beach for 11 consecutive days. each day the temperature and number of visitors was noted. the scatter plot below represents this data. how many people visited the beach when the temperature was 84 degrees?