please help me

[0, 12] to solve Exercises 31-32. Graph of a Model for Discharges under "Don't Ask, Don't Tell" 1200 (4. f1411 1100 (7, f(71) 1000 Number of Discharges f(x) = 1.1x3 -35x2+ 264x + 557 600 [12, f[12)] 10, f10]] 0 3 4 5 6 7 8 9 10 11 12 13 Years after 1994 31. a. Find the slope of the secant line, rounded to the nearest whole number, from x1 = 0 to x2 = 4. b. Does the slope from part (a) underestimate or overestimate the average yearly increase that you determined in Exercise 29? By how much