7866 divided by 13, i already have the answer but i'm having problems figuring the remainder. pls help me

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 could explain what happened when the time was equal to 120 minutes

Anyone know these questions? i need ,.