exam Maths Puzzle Numerical Ability

Can you please help me with these questions?
a) sq. rt. of 12 plus sq.rt. of 108
b) ^3 sq. rt. of 16 times ^3 sq. rt. of 3
Thank you so much for your help.

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exam Other Question

Hi.

What is the least common denominator of the following set:

1/(a+1)^2, 1/(a-1)^2, and 2/a^2-1

Thanks for your help! please help me solve this word problem.

Mary earned $300 per week in January. In February, she received a 10% increase. In the second week of March, her pay was reduced by 10%. What does Mary now earn each week?

Thanks.