exam Maths Puzzle Numerical Ability

Solve 2log4 x - log4 9 = 1.

Simplify sqrt5 - 1/sqrt5.

Simplify (-16x^-3y^2/8xy^-4)^-3.

Thanks.

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exam Other Question

Find a number that is 68 greater than three times its opposite Hello. My question is s=n/2(f+l) and you solve for l.

l=L in lowercase.
Thank you if you help me! I know this is your free time.