What object that measures about 1. 10 cm wide 2. 50 cm long 3. 100 cm long 4. 1 m wide 5. 1 m tall 6. 50m tall 7. 10m wide pls 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%)