Super easy will give brainleist if done before 10 p. m. pls hurry. if u have time pls me on other questions you

Which linear inequality is represented by the graph? !

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

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.