exam Maths Puzzle Numerical Ability

I can't figure out questions 7, 11, 19, 21, 27 on page 259.

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exam Other Question

Simplify rational expressions

y^5-3y^3+8y^2 divided by 5y = y^4/5 -3y^2/5 + 8y/5 Determine the domain and range of the relation
{(-1,4), (1,7),(-5,3),(9,8),(11,-7)}