2:6 since there are 6 books and 2 of them are biographies
Answer: 
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Work Shown:

Explanation: I replaced every x with h(x) in step 2. In step 3, I replaced h(x) with 2x+5 just on the right hand side only. From there, expand and simplify.
Y = mx + b
m: slope
b: y -intercept
so the y intercept is -4 or (0,-4) as a coordinate
22 percent of the costumers used the service
and 78 percent didnt