If the radius of this cylinder is doubled, its volume will be

twice as much
four times as much
eight times as much

four times as much

Step-by-step explanation:

The volume of a cylinder is given by :-

, where r is the radius and h is the height of the cylinder.

If the radius of this cylinder is doubled, then the radius of the new cylinedr will be:

R=2r

Now, the volume of the new cylinder is given by :-

Hence, If the radius of cylinder is doubled, its volume will be four times as much.

ryan had a head start of 10 meters.