What is the image of the point (-1,3) after a rotation of 270° counterclockwise about the origin?

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.

Evaluate the expression for the given value of the variable 7a - 4a for a =8

What is the frequency of the sinusoidal graph?