What is the value of 6a + 2a if a = 3?

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.

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)

Askateboard ramp is in the shape of a right triangle what is the height of the ramp