How many ways can you choose three toppings for a pizza from the seven toppings listed on the menu

The radius of a sphere is 3 inches. which represents the volume of the sphere?

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 are linear equations? could'ya explain too me, ? ! and how do you see what graph is a proportional relationship?