exam Maths Puzzle Numerical Ability

I need a little help solving this.



2. (2 pts) Express the following in set builder notation:
Z = {2, 3, 4, 5, 6, 7, 8, 9, 10}

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exam Other Question

How many gallons of a 70% alcohol solution must be mixed with 50 gallons of a 20% solution to obtain a solution that is 60% alcohol What is the Lowest Common Denominator of the following set please:

1/(a+1)^2, 1/(a-1)^2, 2/a^2 - 1