Charles meets with customers on a daily basis. he uses the function f(x)=5/x-8/+20 to calculate how many dollars he the lowest hourly rate that charles charges.

we are given

where

x is number of hours

f(x) is dollars he charges

The charges will be lowest when absolute value will become 0

so, we can set value inside absolute function equals to 0

and then we can solve for x

............Answer

this answer is !