exam Maths Puzzle Numerical Ability

Sally walks 3 miles north of her farm, turns west and walks 4 miles. How far must she walk if she can walk directly back to her farm?

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20) A small firm produces both AM and AM/FM car radios. The AM radios take 15 hours to produce, and the AM/FM radios take 20 hours. The number of production hours is limited to 3 For some reason I just cannot grasp the concept of the domain and range of functions. Can someone please help with this?

Given f(x)=4x^2-2x-6 and g(x)=2x-3, find the domain of (f-g)(x) and the domain of (f/g)(x). Thanks!