exam Maths Puzzle Numerical Ability

Solve 2log4 x - log4 9 = 1.

Simplify sqrt5 - 1/sqrt5.

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

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exam Other Question

(w-12)(aw+9), where a is a real number and a does not equal 0 PRofit: the yearly profit P for a widget producer is a function of the number n of widgets sold.The formula is P= -180 + 100n -4n^2.
Here P is measured in thousands of dollars, n