Choose the Ksp expressions for the following reactions. Ca3(PO4)2(s) 3Ca+2 (aq) + 2PO4 -3(aq)

Ksp = [Ca+2]2[PO4-3] 2
Ksp = [Ca+2]3[PO4-3] 3
Ksp = [Ca+2]3[PO4-3] 2
Ksp = [Ca+2]2[PO4-3] 3

Amixture initially contains a, b, and c in the following concentrations: [a] = 0.300 m , [b] = 1.05 m , and [c] = 0.550 m . the following reaction occurs and equilibrium is established: a+2b⇌c at equilibrium, [a] = 0.140 m and [c] = 0.710 m . calculate the value of the equilibrium constant, kc.