By Bernard Kolman; Arnold Shapiro

ISBN-10: 0124178758

ISBN-13: 9780124178755

ISBN-10: 1483271218

ISBN-13: 9781483271217

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67. A stationery store had a loss of $400 for its first year of operation and a Joss of $800 for its second year. How much money did the store lose for the first two years of its existence? 68. A bicycle repair shop had a profit of $150 for the month of July and a loss of $200 for the month of August. How much money did the shop gain or lose over the two-month period? 69. E. & E. Fabrics had a loss of x dollars during its first business year and a profit of y dollars its second year. Write an expression for the net profit or loss after two years.

The number TT is irrational; therefore, we cannot say are approximations for computational use only. " 3, -j-, These where the PROGRESS TEST 1A 2. l . 72 are (a) natural numbers (c) irrational numbers The numbers numbers ;, V3, - � are (c) real numbers (b) rational num- (d) none of these. (a) irrational numbers (d) none of these. (b) rational 37 38 -3 3. 4. 4. 3;0-=_� a = 3, b 2. 5. 2xx -6y -y x -1, y = 1. 3[(a + 2b) -(2b -a)] a = -2, b = -1, = 5(xa-y)1 b )-3(2bx2-y)a ). 8. 2 ( + ( 112+-81 _181 1 2 10.

4 (c) 0 = EXAMPLE 2 (a) 1 -3 1 + 1 -6 1 = 3 + 6 = 9 (b) 1 3 - 5 1 - 1 8 - 61 = 1 -2 1 - 1 2 1 = 2-2 = = 16 - 8 1 0 (c) (d) 141 - 61 12 � 8 1 11--3611 63 2 I �6 1 i -21 2 71 (d) 29 --- = -- = - = - I = = 1 - 21 - 1 - 41 1 -4 3-1 -1 - 61 PROGRESS CHECK 2 Find the values. -=21 (c) I - IOI -1 (b) (c) 2 3 (d) 1 2 The absolute value of a number is, then, always nonnegative. But what can we do with the absolute value of a variable, say lxi? We don't know whether x is positive or negative, so we can't write lxl = x.

### Algebra for college students by Bernard Kolman; Arnold Shapiro

by Robert

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