Help pls

Solve this problem! extra ! 3025/5.5 = a/90.75

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%)

Grant simplified the expression 1.5(-3.2 + 2.5) his work is shown below explain the error in grants work