Need help with this thank you

[tex]5 \times1 \frac{12}{13} [/tex] me

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%)

How many square centimeters of wrapping paper will be used to wrap the shoe box?