Can someone please explain how to solve this question

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

Right triangle xyz has a right angle at vertex y and a hypotenuse that measures 24 cm. angle zxy measures 70º. what is the length of line segment xy? round to the nearest tenth. 8.2 cm 8.7 cm 22.6 m 25.5 cm

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3