1,326 prompts matching "Classifying a mixed list of numbers as rational or irrational"
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Practice: A diagonal matrix
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Learn: Deciding whether a stated matrix calculation is possible at all
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Practice: Evaluating AB minus BA
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Explain Back: Solving a matrix equation containing both a sum and a product
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Quiz: Finding an unknown entry from a stated matrix equation
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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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Learn: Swapping and negating the entries when inverting a 2 by 2 matrix
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Quiz: Checking an inverse by multiplying to get the identity
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Practice: Why a 2 by 2 matrix with determinant nought cannot be inverted
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Quiz: Checking a 3 by 3 inverse by multiplication
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Explain Back: Solving two simultaneous equations by multiplying by the inverse
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Practice: What a singular coefficient matrix says about the equations
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Quiz: Solving three simultaneous equations with the inverse matrix
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Explain Back: Why the total moment about any point must be nought
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Learn: Choosing the point about which to take moments
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Practice: Limiting friction, and the greatest value it can reach
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Explain Back: A particle hanging from two strings set at different angles
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Spot My Mistake: Why the probabilities in a distribution must sum to one
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Quiz: The situations a Poisson distribution models
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