Write equations for N which represent the following processes, and then use them to calculate a result for the data supplied:

(i) I think of a number, n, and add 3, giving a value, N. Use the equation to calculate N for n = 6.

(ii) I think of a number, n, double it, and then add 3, giving a value, N. What is N if n = 2?

(iii) I think of a number, n, add 3, and then double the result to give a final value, N. What is N if n = 2?

(iv) I think of a number, n, add 3, double the result, take away 6, and then divide by 2, to give a final value, N. What are the values of N if n = 2, 6, 11?