book Maths Puzzle Numerical Ability

Please help me find the domain and range of each function:
{(-2,3),(4,5),6,7)}

Thank You

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book Other Question

a group of 80 people attended a ball game. There were three times as many children as adults in the group. How many children were in the group? If Sin B = .8192 and B lies in the second quadrant, find cos B and sin 2B by using sin^2x + cos^2x = 1