Algebraic expression 5a² - 25b²​

Solve the equation x/4 - 5= -8 -27 -12 -7 12

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

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.