Add (7x^2-3x) + (5x-6) a. 7x^3 +2x -6 b. 4x^2 -x c. 7x^2 -2x-6 d. 7x^2- 8x-6

Pls! does anybody know a shortcut for answering these types of questions in the future?

What could explain what happened when the time was equal to 120 minutes

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.