ANSWER

EXPLANATION
The given function is

This function is defined for values where the denominator is not equal to zero.


The domain is

Or

Well if the student already finished 6 problems out of 15, there are 15-6 = 9 homework questions she still has to finish.
Still needs to complete: 9.
Already finished: 6
9 : 6.
Simplified: 3 : 2
Answer:
$16.50
Step-by-step explanation: