The teacher needs 58 feet of rope to make a new station in the gym. She will use of the green rope and part of the blue rope .When she is done, there is 6 feet of extra blue rope

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)