Giving away another 100 better get there fast

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

Could somebody me with this radical simplification?

Zack notices that segment nm and segment pq are congruent in the image below: which step could him determine if δnmo ≅δpqr by sas? (5 points) segment mo ≅ segment qr segment on ≅ segment qp ∠ n ≅ ∠ r ∠ o ≅ ∠ q