The radius of a sphere is increasing at a rate of 3 mm/s. how fast is the volume increasing when the diameter is 100 mm?

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.

3382-299=3383- ? fill in the blank?

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.