For the heisenburg uncertainty principle, where did the 4 pi come from in the equation, which is "x times p is greater than or equal to h divided from 4 pi"?

That factor appears when you actually do the quite complex maths that lead to the principle; it's quantum mechanics, and it's not something that can be shown easily.

What is important to note is that this factor is not important. What is important is that the uncertainty  is approximately of the order of , which is a characteristic value that appears in many (most) formulas dealing with quantum mechanics.

The answer is c. 320 g

The answer to this problem is. 67