In your class, you have scores of 83,70, 83, and 80 on the first four of five tests. To get a grade of , the average of the first five tests scores must be greater than or equal to 70 and less than 80 .
a.
Solve an inequality to find the least score you can get on the last test and still earn a C.
b.
What score do you need if the fifth test counts as two tests?