Question

Help with this question ??

Answer 1

5

Explanation:

The average rate of change of f(x) in the closed interval [ a, b ] is

`(f(b)-f(a))/(b-a)`

Here [ a, b ] = [ 4, 8 ] and from the graph

f(b) = f(8) = 10

f(a) = f(4) = - 10, hence

average rate of change =
`(10-(-10))/(8-4)` =
`(20)/(4)` = 5