Factor as the difference of squares

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

If benito is selecting samples of five values from the table, which row will result in the greatest mean? population data row 1 4 2 2 3 3 row 2 3 3 4 3 2 row 3 2 4 3 4 3 row 4 3 4 4 7 3 row 1 row 2 r

Can someone answer this question for me