Answer:
Step-by-step explanation:
This is more easily understood if you take out a common factor of -1
-1(x^2 + 15x + 56)
7*8 = 56
7 + 8 = 56
-1 (x +8)(x+7)
6,271
For x = 20 days: f(20) = 33(1.3)^20 = 33(190.0496377) = 6,271