1,333 prompts matching "Why a rational number added to an irrational one stays irrational"
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Quiz: Solving a matrix equation of the form A plus X equals B
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Spot My Mistake: Squaring a 2 by 2 matrix
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Spot My Mistake: Multiplying a 3 by 3 matrix by a 3 by 1 column
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Worked Example: The associative law for the product of three matrices
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Learn: The distributive law for a scalar over a sum of matrices
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Learn: Deciding whether a stated matrix calculation is possible at all
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Spot My Mistake: Checking a Cramer's rule solution by substituting back
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Spot My Mistake: Finding the adjoint of a 3 by 3 matrix
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Learn: The order of the steps in inverting a 3 by 3 matrix
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Quiz: Checking a 3 by 3 inverse by multiplication
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Worked Example: Checking the solution of three equations by substitution
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Worked Example: The weight of a body as mass times g
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Quiz: The coefficient of friction between two surfaces
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Spot My Mistake: The moment of a force whose line of action is not perpendicular
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Worked Example: The moment of a force about a point on its own line of action
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Learn: The algebraic sum of moments when the senses differ
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Spot My Mistake: Finding two unknown tensions from three forces in equilibrium
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Learn: Finding two unknown forces by Lami's theorem
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Spot My Mistake: The probability of exactly r successes in n trials
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Quiz: The situations a Poisson distribution models
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