What do the three red tiles in the model of the equation below represent?

2 long x tiles and 3 square 1 tiles = 3 negative x tiles
–3
3
–3x
3x

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

Which of the following is the result of expanding

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.