What is the rule for comparing any negative number to any positive number?
QUESTION
What is the rule for comparing ba and dc when b and d are the same positive number?
QUESTION
What is the rule for comparing two positive fractions ba and dc using cross products?
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ANSWER
Compare ad and bc; if ad>bc then ba>dc. Cross-multiplying compares a/b and c/d by checking if a⋅d>b⋅c, preserving the inequality for positive denominators.