exam Maths Puzzle Numerical Ability

Determine the domain and range of the relation
{(-1,4), (1,7),(-5,3),(9,8),(11,-7)}

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exam Other Question

I can't figure out questions 7, 11, 19, 21, 27 on page 259. i cant solve this problem because of lack knowing in solving this algebra problem 2^3 2^3
x^4 x
(4^4 y^7) (-5x^5y^2)
(4nx^5^n) (5nx^4^n)
(2^3)^2