According to the graph, what is the value of the constant in the equation
below?

Asphere has a diameter of 10 in. what is the volume of the sphere?

What is the value of x in the equation 2(x-4) = 4(2x + 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.