If 3/5 of a number is 6 less than 15, the number is a. 15 b. 45 c. 30 d. 50 (explanation would be appreciated)

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F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

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.