Can y’all help me on question 35?!

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%)

I'm a polygon i have no parallel lines i am formed 3 line segments i have one right angle two of my angles are angles what am i

What is the value of x? enter your answer in the box.