A ball with an initial height of 240 inches falls vertically. every time the ball bounces it bounces back up reaching only half of its height. write a function to represent the height of the ball. after 10 bounces, how high will the ball bounce?

Please help i need this in by 12!!

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%)