What is the average rate of change of f(x), represented by the graph, over the interval [-1, 2]? a) -2.5b) -2c) 2.5d) 3e) 6

We know that
the average rate of change=[f(x2)-f(x1)]/(x2-x1)
interval [-1, 2]

for x1=-1
f(x1)=-5

for x2=2
f(x2)=2.5

therefore
average rate of change=[f(x2)-f(x1)]/(x2-x1)> [2.5-(-5)]/[2-(-1)]> 7.5/3
average rate of change=2.5

the answer is
2.5

Value is 6 i think k