Rate this pic ok the turth ok

What is the smallest integer n such that n\sqrt{2} is greater than 20

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

Which system of linear inequalities is represented by the graph? x-3y > 6 and y? 2x + 4 x + 3y > 6 and y? 2x - 4 x - 3y > 6 and y? 2 - 4 x + 3y > 6 and y > 2x + 4 no be 2 -1.1 1 2 3 4 5 submit save and exit next mark this and retum be