Adiver begins at 140 feet below sea level. she descends at a steady rate of 7 feet per minute for 4.5 minutes. then, she ascends 112.2 feet. what is her current depth?

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%)