Please help me, thanks

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.

Which of the following scenarios demonstrates an exponential decay

Alex measured the length of an item to be 3.7 cm. the actual length is 3.5 cm. what is alex’s percent error?