Y+4/12-y-1/12=y/2

Pls! on a time limit

Fredrick designed an experiment in which he spun a spinner 20 times and recorded the results of each spin

What value of x is in the solution set of 4x – 12 s 16 + 8x?

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%)