the intersecting point of the two lines is (2.2999999,4.1)
The average rate of change of a function f(x) on the interval [a,b] is given by:
f(b) - f(a)
-------------
b-a
In this specific case, a=2 and b = 3.
f(2) = -3 and f(3) = -1.
Thus, the average rate of change here of f(x) on the interval [2,3] is:
-1 - (- 3) 2
------------- = ------------- = 2 (answer)
3-2 1
Recall that the conversion of 155% to decimal is to divide by 100. Thus, 155%=1.55.
Now, multiply this by 80:

So our answer is 124.
She would have 10 blocks of butter each weighing .20 pounds