1,334 prompts matching "Writing the solution of an inequality as a set"
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Spot My Mistake: A symmetric matrix, equal to its own transpose
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Practice: The condition on the orders for a product to exist
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Learn: Deciding whether a stated matrix calculation is possible at all
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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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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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Practice: Why a 2 by 2 matrix with determinant nought cannot be inverted
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Spot My Mistake: Why the inverse must be applied on the correct side
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Practice: What a singular coefficient matrix says about the equations
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Practice: Comparing the inverse method with elimination for three equations
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Quiz: Recovering the original force from its two components
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Explain Back: Showing that a system of concurrent forces is in equilibrium
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Learn: A space diagram and a force diagram drawn side by side
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Practice: Why the forces must sum to nought in two perpendicular directions
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Learn: Choosing the point about which to take moments
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Practice: Finding an unknown force from a closed polygon
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Learn: Finding two unknown forces by Lami's theorem
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Explain Back: A probability distribution table for a discrete random variable
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Spot My Mistake: Why the probabilities in a distribution must sum to one
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