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The collection of integers is denoted by ‘Z’ or ‘I’.

Thus, Z = {…, -4, -3, -2, -1, 0, 1, 2, 3, 4, …}

Zero is neither a negative nor a positive number. It is a neutral number.

This system also has infinite numbers towards negative as well as positive sides. Therefore the smallest and the largest integers cannot be obtained. In this system, any number can be obtained by adding 1 to its previous number.

On adding + 20 and – 16, we get:

(+ 20) + (- 16) = + 20 – 16

= + 4; which is positive

Therefore the position of the man with respect to his starting point is 4 m due east.

Final temperature = Initial temperature + rise in temperature + fall in temperature.

= 0 + (+ 25) + (- 32) =-7 degree C.