Estimate at 15% tip on a dinner bill of $39.84 by first rounding the bill amount to the nearest $10
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<u>We know that (a + b)(a - b) = a² - b²:</u>
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<u>We know that (a + b)(a - b) = a² - b²:</u>
Answer: LCD = ( x + 1) (x - 1)
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