what does -4.2-(-2.9)= equal

Simplify. show your work. ( 6x-2 ) ^2 ( 0.5x )^4

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.

4+(2+x) can you me solve this problem