Express each statement as an equation involving the indicated variables. [ATTACH=full]1795[/ATTACH] For 139, A = sqrt{3}/2•x, where x = side of triangle. For 140, P = 3x, where x = side of triangle. For 141, V = (4/3)(pi)(r^3), where r = radius of sphere. For 142, S = 4•pi•r^2, where r = radius of sphere. You say?