1,334 prompts matching "A word problem about seats in the rows of a hall"
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Worked Example: Forming the determinant Dy by replacing the second column
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WAEC Prep: What Cramer's rule gives when the system is inconsistent
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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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Learn: Swapping and negating the entries when inverting a 2 by 2 matrix
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Quiz: Checking an inverse by multiplying to get the identity
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WAEC Prep: Checking the determinant before attempting a 3 by 3 inverse
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Spot My Mistake: Why the inverse must be applied on the correct side
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Quiz: Solving three simultaneous equations with the inverse matrix
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Practice: Comparing the inverse method with elimination for three equations
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WAEC Prep: The newton, and how it is defined
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Quiz: Recovering the original force from its two components
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WAEC Prep: The forces on a body resting on a rough horizontal plane
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WAEC Prep: The forces on a body suspended by a single string
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Worked Example: Marking the weight, the normal reaction and the friction on a diagram
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WAEC Prep: The two conditions for a rigid body to be in equilibrium
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Practice: Why the forces must sum to nought in two perpendicular directions
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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: The conditions for a particle under three forces to be in equilibrium
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