exam Maths Puzzle Numerical Ability

The relative density of an object may be defined as its weight in air Wa, divided by the difference of its weight in air and its weight when submerged in water, Ww. For a lead weight, Wa = 1.097 Ww. Find the relative density of lead.

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Hi! Can you help me with the problem:

Write an expression for the difference of 4 and the square of a number.

I do not know whether it is 4 - n^2 or n^2 - 4

Thanks. :) Find the domain of the function
f(x)=1
_____
x-4