The prism-shaped roof has equilateral triangular bases. create an equation that models the height of one of the roof's triangular bases in terms of its sides. in your final answer, include all necessary calculations.

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%)