exam Maths Puzzle Numerical Ability

What is the domain of the function F given by F(x)=x+4/x ?
I think the answer is "all reall numbers except 0"

Given f(x)=4-x-x^2 find f(3)

I think th answer is f(3)=-8

thank you!

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exam Other Question

p/q+q/r / r/s+s/t The start-up cost for producing widgets is $449, and each widget costs $91 to produce. Write the function relating x (number of widgets produced) with C(x) or the cost for producing that many widgets.

Thank you.