Select the correct answer. Find the solution(s) for x in the equation below. 12 + 10 + 21 = 0 A x = -3; x = -7
B. x = -3; x = 7
c. x = 3; x = -7
d. x = 3; x = 7​

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a

What are the solutions of the equation x4 + 6x2 + 5 = 0? use u substitution to solve.