I need help with this thanks to whoever helps :)

Divide. write in the simplest form. 4 1/6 divided by 10

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%)

Which polygon is she in the process of constructing ?