Is 1.4949949994.. a rational number

Me because some of question i don’t understand

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?

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?