book Maths Puzzle Numerical Ability

REVISED VERSION...left out a number...
Perform the operations and simplify.Please show in detail how it is reached?

(The line in between the fractions didnt come through...sorr

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book Other Question

how do u find out the sale price and the sale taxes of 340.00 and my discount is 75%? use the square root property or complete the square

[(x/3) + 4]^2 = 27

I think I have an idea on how to do this, I just am confused as to how to raise x/3 + 4 to the 2nd powe