exam Maths Puzzle Numerical Ability

How do you find a domain and range of a graphed vertical line test once you know its a function?

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exam Other Question

Hi I have a couple questions that weren't really covered very well in class. Any help would be great.
1. {{{5/x-5+2/x=-10/x^2-5x}}}

2. {{{1-3/2x=7/4}}}

3. {{{2/t=t/5t-12} 1) What are some uses of polynomials in the "real world"?