What is the answer to y×3=5×4

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.

What is the equation of the graph below? y=sec(x)-4

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?