800 prompts matching "Quiz: Checking a surd equation for extraneous roots"
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Quiz: The zero matrix, and how it differs from nought in arithmetic
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Quiz: Expanding a 3 by 3 determinant along a row or column containing noughts
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Learn: Solving two simultaneous equations by Cramer's rule
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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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Spot My Mistake: Checking cofactors by expanding the determinant along a second row
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Practice: What a singular coefficient matrix says about the equations
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Quiz: Why mass stays the same wherever the body is taken
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Quiz: The coefficient of friction between two surfaces
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Quiz: The situations a Poisson distribution models
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Quiz: The standard deviation of a Poisson distribution
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Quiz: The area under the normal curve, and what it represents
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Quiz: The probability in the upper tail of a normal distribution
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Quiz: Reading the wording of a question to decide which distribution applies
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Quiz: Writing a two-dimensional vector as a column
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Quiz: The direction cosines of a vector in three dimensions
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Quiz: The direction of a vector as an angle with the x-axis
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Quiz: Subtracting one complex number from another
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Quiz: The product of a complex number and its conjugate
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Quiz: The argument of a complex number
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Learn: The cube roots of unity
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