The formula for the lateral surface area of a cylinder is S=2πrh, where r is the radius of the bases and h is the height. Solve for h.
h=s/2πr
h=2Sπr
h=r/2Sπ
h=Sr/2π

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%)