If someone could please help asap

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.

Multiplying an even number of negative numbers gives an answer that is choose from:

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup