For what values of k does kx^2-6x 13=0 have no real roots?

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.

Use the graph of the sine function y=2sinθ shown below

What are the values of each variable in the diagram below?