What is the nearest tenth of 9.831 in a vertical number line

Find the quotient. 50a2 – 98b2 -5a +7b

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

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.