Abank charges $0.25 per check and its monthly fees are $10. if jerome issues 10 checks in a month, how much will a monthly checking account cost him?

For this case, the first thing we must do is define variables.
 We have then:
 x: number of checks.
 y: total cost.
 We now write the linear function that represents the problem.
 We have then:
 
 Then, Jerome issues 10 checks in a month.
 Therefore, we evaluate the function for x = 10.
 We have then:
 
 
 a monthly checking account will cost him about:
 y = 12.5 $

Multiply 0.25 per check by 10 checks and then add that to the monthly fee of $10.

0.25 x 10 = $2.50 for 10 checks.

$10 + $2.50 = $12.50 total per month.