What is the sum of numbers in row 9 of pascal triangle if row 2 has the number 1, 2 and 1?

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.

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?

Complete the solution of the equation. find the value of y when x equals to 1 9x-5y=29