Which statement is true about the graphs show?

What are the domain and range of f(x)=[1/5]x

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?

The graph shows the distance kerri drives on a trip. what is kerri's speed . a. 25 b.75 c.60 d.50