exam Maths Puzzle Numerical Ability

If a = -3 and b = 4, evaluate 3a - 4b.

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exam Other Question

What is the simplest form of (3^n)(9^n-2)sqrt4(^4n+2)/4(^2n+1) Note:the 4(^2n+1) is the denominator The radius of a circle is 16 inches what is the circumference and what is the area?