The red and white cylinders are similar. The red cylinder has a radius of 14 inches and a volume of 1021. The white cylinder has a radius of 5 inches. What is the volume of the white cylinder?

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

Having a hard time understanding this question (see attachment).