Answer:
40 Squared units
Step-by-step explanation:
In the interval from x=-1 to x=2, x increases by 3. In that same interval, y increases by 6 from -3 to +3. The average rate of change is
.. average rate of change = (increase in y)/(increase in x) = 6/3 = 2
The average rate of change is 2 over the given interval.
A 40 is the lowest she can make and that would give her exactly a 70 average.
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