book Maths Puzzle Numerical Ability

What is a domain?

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A 55-gallon barrel contains a mixture with a concentration of 40%. How much of this mixture must be withdrawn and replaced by 100% concentrate to bring the mixture up to 75% concen Hi Tutors:
I am on the last problem of my homework and I need help. Please help me find the domain and range of this problem. x^2+2x/|10x-20|