Can someone help me with this geometry question ASAP ty

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.

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Yo need asap pls ! markin da brainiest too !