Acone has a base radius of 7 centimeters and a height of 21 centimeters.

what is the volume of the cone?

a.
28π cm^3

b.
49π cm^3

c.
147π cm^3

d.
343π cm^3

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.

Aye asap pls ! markin da brainiest too ! btw da step choices are all add, distribute, divide, n subtract

Which is the focus of a parabola with equation y2=4x