Which expression represents “x less than 9” A. x + 9

B. 9 - x

C. x - 9

D. 9 + x

I’ll give brainliest to whoever answers first!

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.

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9

What is y times x by? y is __ times x