1,334 prompts matching "Sum of the first n terms of an arithmetic series"
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Explain Back: Solving a matrix equation containing both a sum and a product
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WAEC Prep: Expanding a 3 by 3 determinant down a column
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Quiz: Expanding a 3 by 3 determinant along a row or column containing noughts
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WAEC Prep: The cofactor of a corner entry
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WAEC Prep: Why the cofactor signs alternate
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WAEC Prep: The adjoint of the identity matrix
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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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Worked Example: Checking the solution of three equations by substitution
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WAEC Prep: The weight of a body on the moon compared with on earth
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Worked Example: The weight of a body as mass times g
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WAEC Prep: The component of a force at thirty degrees to the horizontal
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Learn: The component of a force along a stated direction
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WAEC Prep: A table of components used to find a resultant
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WAEC Prep: The polygon of forces for five concurrent forces
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WAEC Prep: The polygon of forces for several forces in equilibrium
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Worked Example: Drawing the polygon of forces to scale
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Learn: What an unclosed polygon of forces tells you
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Quiz: The coefficient of friction between two surfaces
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Practice: Limiting friction, and the greatest value it can reach
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