1,321 prompts matching "Factorising fully, and knowing when to stop"
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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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WAEC Prep: When Cramer's rule is quicker than elimination
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WAEC Prep: What Cramer's rule gives when the system is inconsistent
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Quiz: Arranging the equations in standard form before applying Cramer's rule
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Quiz: Checking an inverse by multiplying to get the identity
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WAEC Prep: When the matrix method is worth the work for three unknowns
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Spot My Mistake: The greatest and the least resultant of two given forces
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WAEC Prep: Why one component vanishes when the direction is chosen well
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Spot My Mistake: Drawing the triangle of forces to scale to find an unknown force
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Learn: The algebraic sum of moments when the senses differ
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Quiz: The point about which the total moment of a set of forces vanishes
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Spot My Mistake: Using concurrence to find the direction of an unknown third force
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Quiz: A rod resting against a wall, and the concurrence of its three forces
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Spot My Mistake: Why the probabilities in a distribution must sum to one
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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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Spot My Mistake: The proportion of a normal distribution within one, two and three standard deviations
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Spot My Mistake: Reading a probability from the standard normal table
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Practice: Using the normal tables when the z-score is negative
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