Verify or show the following properties:

a) Associative Laws: ( ∪ ) ∪ = ∪ ( ∪ )

Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2 - 20 = x a. 5, 4 b. -5, -4 c. -5, 4 d. 5, -4

D(5, 7). e(4,3), and f(8, 2) form the vertices of a triangle. what is mzdef? oa. 30° ob. 45° oc. 60° od 90°

How can (square root of 25) ^2 be rewritten?