Please answer correctly

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.

If lmn=xyz, which congruences are true by cpctc? check all that apply

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°