Download Algebra: Form and Function by William G. McCallum, Eric Connally, Deborah Hughes-Hallett PDF

By William G. McCallum, Eric Connally, Deborah Hughes-Hallett

This e-book bargains a clean method of algebra that specializes in instructing readers find out how to actually comprehend the rules, instead of viewing them only as instruments for different kinds of arithmetic. It depends upon a storyline to shape the spine of the chapters and make the fabric extra attractive. Conceptual workout units are incorporated to teach how the knowledge is utilized within the actual international. utilizing symbolic notation as a framework, enterprise pros will come away with a enormously more suitable ability set.

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Twice the combined salary of Jason, J, and Steve, S, is $140,000. 55. J/8 = 4 56. b − 15 = 25 67. 225 pounds is ten pounds more than Will’s weight, w. 57. 5 = 1 − d 68. 50 pounds less than triple Bob’s weight, w. Apago PDF Enhancer PROBLEMS 69. A company outsources the manufacturing of widgets to two companies, A and B, which supply a and b widgets respectively. However, 10% of a and 5% of b are defective widgets. What do the following expressions represent in practical terms? day. If c is the number of calories, g the grams of fat, and f the grams of dietary fiber, then the number of points for a piece of food is Number of points = c g f + − .

During a sale month it halves the price but sells three times as many bicycles. Write an expression for the revenue during a sale month. Does the revenue change, and if so, how? 1 REORDERING AND REGROUPING Solution 31 Since the bike shop sells q bicycles during a normal month, and since that number triples during a sale month, it sells 3q bicycles during a sale month. Similarly, the price is (1/2)p during a sale month. Thus, 1 Revenue during sale month = (3q) p . 2 By regrouping and reordering the factors in this product we get Revenue during sale month = (3q) 1 p 2 1 3 = 3 · qp = qp.

When you go to the store you discover that there is a 25% off sale on all pants, but no further discounts apply. For what tag price do you end up paying the same amount with each discount method? Solution Let p be the tag price, in dollars, of a pair of pants. 75p. 75p. 1 shows that you pay the same price with either discount method when the tag price is $40, but different prices when p = 20, 30, 50 or 60. 50 45 So p = 40 is a solution to the equation, but the other values of p are not. In Example 1 we found one solution to the equation, but we did not show that there were not any other solutions (although it seems unlikely).

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