19.75 with a 6 percent tax

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

Plz help plz give me the answer

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60