exam Maths Puzzle Numerical Ability

evaluate each expression for the replacement set (2,3,6)

y divided by 2

3y

3 plus y

3 minus y

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exam Other Question

Is the following a perfect trinomial:
x^2 + 18x + 81
Thank you for the help, these always confuse me! 5-2(y-5)=27 how do you solve and check that and could you show all steps and give a free ex. please and thank you