Given line p is parallel to line q, measure of angle 3 = 5x - 3 and measure of angle 8 = 4x - 6, find x.

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%)