The equation 25x2 25y2 = 125 represents which conic section?

If 20% of a number is 35, what is 50% of that number?

Which region represents the solution to the given system of inequalities? |-0.5x+y23 | 1.5x+ys-1 5 4 -3 -2 -1 1 2 3 4

Does the point (1, sqrt 7) lie on circle shown.