PLEASE HELP! jeowniwnowjeijwenwisnek

What is the volume of a cone with a height of 6 cm in the radius of 2 cm

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%)

What is the maximum of the sinusoidal function