book Maths Puzzle Numerical Ability

Hi Tutors:
Can you please help me find the domain and range of : g(x)=x^2+2x/|10x-20|
Thanks in advance
Sharmaine

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book Other Question

How do you show that the number is rational by writing it as a quotient of two integer? Sarah is visting a friend about two miles away from her house. she sees a hot-air balloon directly above her house. Sara estimates that the angel of elevation formed by the hot-air balloon is about 15 degrees. about how high is the hot-air balloon?