book Maths Puzzle Numerical Ability

How do you show that the number is rational by writing it as a quotient of two integer?

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hue put 450.00 in an account that pays intrest at an annual rate of 3% how much will she have in 2 years? Hi Tutors:
Can you please help me find the domain and range of : g(x)=x^2+2x/|10x-20|
Thanks in advance
Sharmaine