1,333 prompts matching "an AP where the 4th term is 15 and the 9th term is 35, find the first term and c"
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Worked Example: Evaluating a 3 by 3 determinant by the rule of Sarrus
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Worked Example: Forming the determinant Dy by replacing the second column
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Explain Back: What a coefficient determinant of nought says about the system
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Quiz: Arranging the equations in standard form before applying Cramer's rule
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Worked Example: The identity that A times its adjoint gives the determinant times the identity
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Spot My Mistake: Why the inverse must be applied on the correct side
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Practice: The value of g used in Nigerian examination papers
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Quiz: The point about which the total moment of a set of forces vanishes
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Learn: The expectation of a discrete random variable
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Practice: The variance of a binomial distribution as npq
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Learn: The standard deviation of a binomial distribution
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Quiz: The standard deviation of a Poisson distribution
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Explain Back: Testing whether data are Poisson by comparing mean and variance
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Learn: The mean, median and mode of a normal distribution
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Spot My Mistake: The proportion of a normal distribution within one, two and three standard deviations
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Worked Example: The distance between two points in three dimensions
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Quiz: The direction of a vector as an angle with the x-axis
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Explain Back: The locus of a complex number at a fixed distance from a point
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Explain Back: The constant of integration, and why it appears
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Worked Example: The area between a curve and the x-axis
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