Solve the equation 5(z-4)-z=4z-20

Which fraction below is equivalent to 10/12?

Solve the system of equations. y= 2x y= x^2 - 15

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.