HELP ME ON MY QUIZ PLEASE AND THANK YOU :)

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

Which part of a 2-column proof is the hypothesis of the conjecture? a) given b) reasons c) prove d) statements ! i think it's b but i'm not quite

Which ratios are equivalent to 10: 16? check all that apply. 30 to 48 25: 35 8: 32 5 to 15