Answer:
-4
Step-by-step explanation:
The average rate of change from x=a to x=b of f(x) is 
The given function is
.
.
.
The average rate of change from x=3 to x=4 is given by:
25 sales. you start with 50 and get $2 per sale in that week. if you make 25 sales, 25*2= 50. then do 50+50=$100
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