A cylinder has a volume of 451 cubic units and a radius of
3 units.
What is its height?

Ineed asap.i cant understand this question i need someone to me right away

Three cylinders have a height of 8 cm. cylinder 1 has a radius of 1 cm. cylinder 2 has a radius of 2 cm. cylinder 3 has a radius of 3 cm. find the volume of each cylinder ( ! : ”0 )

Can someone check if i did this correct. it’s number 4 if you’re wondering.