3. In the xy-plane, the point (4,21) lies on the graph of the function f(x) = 2x2 – bx + 13. What is the value of b?

Compare these two waves: the blue and orange waves have the same pitch, but the blue wave is louder. the blue and orange waves have the same volume, but the blue wave has a higher pitch. the orange wave has a higher pitch, but the blue wave is louder. the blue wave has a higher pitch, but the orange wave is louder.

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.

Find the value of x to the nearest tenth. a. 4.5 b. 5.4 c. 6.3 d. 7.2