Find d using a trigonometric ratio

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.

The function f(x)= x5+ ( x + 3)2 is used to create a table. if x = -1 then what is f(x)?

Isaac wants the equation below to have no solution when the missing number is placed in the box. which number should he place in the box?