Solve each equation by completing the square. If necessary, round to the nearest hundredth. 10. c 2– 4c = 21

What is the explicit formula for this sequence? -7, -4, -1, 2, a.) an = 8 + (b - 1)3 b.) an = -7 + (n - 1)3 c.) an = 3 + (n -1) (-7) d.) an = -7 + (n - )

Are the corresponding angles congruent? explain why or why not.

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota