Answer:
3 because pretend the rest of the numbers are not there it is 3
This is only one equation. It is therefore not a system and you can not solve for two different variables y and z unless you have another equation to solve with. It.
I think u are supposed to divide like 9.70 divided by 5
(17*3) --- to find the total points of the 3 quizzes
17*3=51
the third quiz grade=51-14-19=18
hope this helps
