At a copy center, 100 copies cost $4.00. At this rate how much will 450 copies cost?

Which triangles area would be calculated using the trigonometric area formula

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.

Can anyone me with 32,33,36,37,and 40.