If Cos Theta = -8/17 and theta is in quad III, COS2 theta = and TAN2 theta =

answers for 1st box 161/289, -161/289, 64/289, -64/289
answers for 2nd box -30/217, -30/161, -240/217, -240/161

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%)