Solve the 7th grade inequalities (a is not correct)

Factor a ^3 - 3 + 3a^2 - a.1) (a - 1)(a + 1)(a + 3)2) (a2 + 1)(a - 3)3) (a2 - 3)(a + 1)

Is it true that product of 3 consecutive natural numbers is always divisible by 6? justifyyour answer

A50-foot ladder is leaning against a vertical wall. if the base of the ladder is 45 feet from the base of the wall, find the angle the bottling of the ladder makes with the ground.