3. A number between 30 and 50 is chosen at random. What's the probability that the number contains at least one 4?

Don't know how to find x given these segment lengths

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.

What is a correct first step in solving the inequality-4(3-5x)> -6x+9