901 prompts matching "Area of a triangle from three coordinates"
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Quiz: Solving AX equals B and XA equals B by different routes
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Practice: A diagonal matrix
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Practice: The condition on the orders for a product to exist
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Practice: Evaluating AB minus BA
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Quiz: Expanding a 3 by 3 determinant along a row or column containing noughts
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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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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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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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Practice: Why the forces must sum to nought in two perpendicular directions
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Practice: Limiting friction, and the greatest value it can reach
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Practice: Using a binomial expansion to approximate a number
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Quiz: The situations a Poisson distribution models
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Practice: Using the normal tables when the z-score is negative
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Quiz: Writing a two-dimensional vector as a column
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Practice: Deciding whether a point lies on a given line
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Practice: Equating real and imaginary parts to find two unknowns
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Quiz: Writing a complex number in polar form
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