Answer:
26
Step-by-step explanation:
W = ∫ f(x) dx
W = ∫₁³ (3x + 7) dx
W = (1.5x² + 7x) |₁³
W = (1.5(3)² + 7(3)) − (1.5(1)² + 7(1))
W = 26
1. 47
2. 70.4 ft per min
3. 13.33333333333333
Because tax is an additional charge to the original amount therefor it is simply an increase