Practice ncea-level-3 questions with answers and explanations.
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|a+bi|=√(a²+b²).
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z=(x−μ)/σ.
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Expected value is the probability-weighted sum.
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Repeated multiplication gives uₙ=u₀rⁿ.
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For a 2×2 matrix, determinant=ad−bc.
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For a 2×2 matrix, determinant=ad−bc.
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d(sin x)/dx=cos x.
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The vertex occurs at x=h.
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Differentiate term by term, then substitute.
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Use the antiderivative ax²/2+bx.
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|a+bi|=√(a²+b²).
Choose an option to check your answer.
z=(x−μ)/σ.
