Find the height of a cone with a volume of 942 cubic units and a radius of 10 units

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)