1,045 prompts matching "The z-score of a value that lies below the mean"
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Show All Working: A quadratic whose two roots are both negative
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Common Mistakes: Checking a completed square by expanding it again
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Show All Working: Roots equal in magnitude but opposite in sign
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Show All Working: Forming an equation whose roots are three alpha and three beta
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Common Mistakes: A word problem giving one linear and one quadratic equation
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Learn: What makes an expression a polynomial
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Show All Working: Adding and subtracting two polynomials
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Learn: Factorising a cubic into three linear factors
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Show All Working: Factorising a polynomial with fractional roots
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Common Mistakes: Factorising fully, and knowing when to stop
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Learn: Solving a cubic once it has been factorised
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Common Mistakes: A cubic equation arising from a volume problem
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Learn: What makes a sentence a proposition
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Show All Working: Translating an English sentence into logical symbols
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Common Mistakes: Translating a symbolic statement back into English
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Learn: How many rows a truth table needs
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Show All Working: Why a conditional and its converse are not equivalent
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Learn: What a tautology is
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Common Mistakes: Deciding between tautology, contradiction and contingency
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Learn: What makes an argument valid
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