Do problem 9
I NEED HELP IM CONFUSED

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%)

Simplify. 3(4+4x) (type your answer in with no spaces)

What else equals 42 and 30 for multiply