For h(x)=3x2−x−4​, find an equation of the given product​ function; then evaluate the product function at the indicated value. h•h​, (h•h)(8)
h*h=???

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%)