The graph below shows the total cost of an internet subscription, c, as it relates to the number of internet hours used, h. how much does the company charge per hour? the company charges $ per hour.   

see the attached clear picture

we know that
the cost of internet that the company charges per hour is equal to the slope of the graph

step 1
find the slope
let
A (3,50)
B (8,75)
m=(75-50)/(8-3)-----> m=25/5----> m=5 $/hour

the answer is
The company charges $ 5 per hour