Which equation can be used to find x, the length of the hypotenuse of the right triangle?
63
16+63 = x
162+63 - X
(16+63)2 = x?
0 16² +63² - x²

Ben wants to play a carnival game that costs $2. in his pocket he has 5 red tickets worth 35 cents each, and 15 blue tickets worth 10 cents each. which of the following systems of inequalities correctly represents the constraints on the variables in this problem? let represent the red tickets and b represent the blue tickets.

The parabola opens: y=√x-4 (principal square root) up down right left

How is working backward similar to solving an equation?