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Unformatted text preview: 99 . 45 = a + 207 · . 35 = a + 72 . 45 , so that a = 27 . Therefore C ( x ) = 27 + (0 . 35) x , 0 5 x < + ∞ . Thus if you drive 175 miles on the third day, the cost for that day will be C (175) = 88 . 25 (in dollars). The slope b = 0 . 35 represents a cost of $0 . 35 per mile. The Cintercept a = 27 represents the daily base cost of renting the car. In civil engineering and in some branches of applied mathematics, the intercept a = 27 is sometimes called the ofset, representing the vertical amount by which C (0) is “o±set” from zero. C01S02.079: Suppose that the letter weighs x ounces, 0 < x 5 16. If x 5 8, then the cost is simply 8 (dollars). If 8 < x 5 9, add $0 . 80; if 9 < x 5 10, add $1 . 60, and so on. Very roughly, one adds $0 . 80 if 9...
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 Spring '11
 CHENG
 Calculus, Decimals, Fractions

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