Please help I’ll mark you brainlist!!!

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.

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?

What is the product? a-3/15a × 5/a-3