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Download e-book for iPad: Algebra I (Cliffs Quick Review) by Jerry Bobrow

By Jerry Bobrow

ISBN-10: 076456370X

ISBN-13: 9780764563706

ISBN-10: 3175723993

ISBN-13: 9783175723998

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Extra resources for Algebra I (Cliffs Quick Review)

Example text

First set up a blank proportion and then fill in the empty spaces by using the following steps. =? ? Example 28: 30 is what percent of 50? 1. Whatever is next to the percent (%) is put over 100. ) x ? 100 = ? 2. Whatever comes immediately after the word of goes on the bot- tom of one side of the proportion. x ? 100 = 50 3. Whatever is left (comes next to the word is) goes on top, on one side of the proportion. x 30 100 = 50 4. Then solve the proportion. x 30 100 = 50 In this particular instance, it can be observed that 30⁄50 = 60⁄100 so the answer is 60%.

X 5 -4=2 Add 4 to both sides. x 5 -4= 2 +4 +4 x = 6 5 Multiply both sides by 5 to get x. x ^5h 5 = ^5h 6 x = 30 Example 4: Solve for x. 3 5 x - 6 = 12 Chapter 4: Equations, Ratios, and Proportions Add 6 to each side. 3 5 x - 6 = 12 +6 +6 3x = 18 5 Multiply each side by 5/3 (same as dividing by 3/5). 5 3 5 c 3 m 5 x = c 3 m 18 J N 6 18 x = KK 5 OO 1 3O KY L1 P x = 30 Example 5: Solve for x. 5x = 2x – 6 Add –2x to each side. 5x = 2x - 6 - 2x - 2x 3x = -6 Divide both sides by 3. 3x = - 6 3 3 x =- 2 Example 6: Solve for x.

Whatever comes immediately after the word of goes on the bot- tom of one side of the proportion. x ? 100 = 50 3. Whatever is left (comes next to the word is) goes on top, on one side of the proportion. x 30 100 = 50 4. Then solve the proportion. x 30 100 = 50 In this particular instance, it can be observed that 30⁄50 = 60⁄100 so the answer is 60%. Solving mechanically on this problem would not be time effective. This method works for the three basic types of percent questions. 1. 30 is what percent of 50?

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Algebra I (Cliffs Quick Review) by Jerry Bobrow


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