Ineeds i have no idea how to do this (image attached)

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.

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%)

Urgentwhat is the area of the figure?