1,334 prompts matching "Cross-multiplying to solve an equation with fractions"
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Practice: Why the forces must sum to nought in two perpendicular directions
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Worked Example: Drawing the polygon of forces to scale
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Practice: Finding an unknown force from a closed polygon
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WAEC Prep: Friction, and the direction in which it acts
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Practice: Limiting friction, and the greatest value it can reach
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WAEC Prep: Calculating a moment as force times perpendicular distance
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Worked Example: The total moment of three parallel forces about one end
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Explain Back: A particle hanging from two strings set at different angles
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WAEC Prep: A random variable, and the values it may take
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Explain Back: A probability distribution table for a discrete random variable
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Worked Example: Finding a particular term of a binomial expansion
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WAEC Prep: The Poisson formula, and what lambda stands for
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WAEC Prep: The mean of a binomial distribution as np
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Practice: The variance of a binomial distribution as npq
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Explain Back: Finding n and p from a given mean and variance
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WAEC Prep: Why the mean and the variance of a Poisson distribution are equal
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Explain Back: Testing whether data are Poisson by comparing mean and variance
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WAEC Prep: The shape and the symmetry of the normal curve
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WAEC Prep: Choosing between a binomial and a Poisson model
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Worked Example: The distance between two points in three dimensions
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