Hi my teacher isn’t the best at explain and she just kinda threw this at us and idk what i’m doing can someone help

Ok so, you know the x and y intercepts.
x intercept: (-6,0), (-1,0)
y intercept: (0,6)
Equation: y = a(x + 6) (x + 1)
Plug in y intercept for y
6 = a(0 + 6) (0 + 1)
6 = a(6)(1), a = 1
Final equation: y = (x+6)(x+1)

the answer would be c ≈ 18.852*3.14= 6.286.28*3=18.85