Is this a linear trinomial, forth-degree trinomial, quadratic trinomial or a degree-8 polynomial?

Select the quadratic that has root x = 8 and x = -5

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?

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)