A student finds the slope of the line between (3,-2) and (9,3). She writes 3+(2)/9+3 what mistake did she make

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?

In the geometric progression –3, 12, −48… what term is 3,072?

Extra points! find the missing dimension! need asap