Solve the following initial value problem: ,dy y 32 dt with y(0) 3 (find y as a function of t.) y=(32t-256)+259^(-t/8)

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%)