Answer:
A numerator is allowed to take on the value of zero in a fraction. Any legal fraction (denominator not equal to zero) with a numerator equal to zero has an overall value of zero. all have a fraction value of zero because the numerators are equal to zero.
2n-19 I think is the answer :3
10.69 just use a calculator
Idk how to this but look up the app Socratic and scan the question it should helped