Answer: 30 something?
Step-by-step explanation:
1). Add 4 to each side of the equation.
2). Multiply each side by 7 .
3). Step numbly to one side, as the answer
comes shooting off the page at you.
The graph of the function 
is
- concave upward, when
- concave downward, when
Find 
1.
2.
Now:
1. when 
the graph of the function is concave upward and this is for
2. when 
the graph of the function is concave downward and this is for
3600 boxes divided by 60 trucks = 60 boxes per truck.
Multiplying 72.15 by .11 or 11% gives you 7.94 - this is the tax taken.
so just subtracting that from 72.15 gives you $64.21 as your answer.
