book Maths Puzzle Numerical Ability

Simplify the Expression:
r+3-6r+r

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book Other Question

Hi.

I am having trouble understanding this question and it reads as follows:

(x+3)^2 = 12

Thanks to anyone who can help! 4(-2/3+4/3)

1000 divide (1+ 0.09/4)to the 8th power

3 to the 2nd power +1/0