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Algebra I by Jerry Bobrow Ph.D.

By Jerry Bobrow Ph.D.

By way of pinpointing the things you actually need to understand, no one does it higher than CliffsNotes. This speedy, powerful educational is helping you grasp middle algebraic innovations -- from monomials, inequalities, and analytic geometry to features and diversifications, roots and radicals, and note difficulties -- and get the very best grade.

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Additional info for Algebra I

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When using z, you may wish to write it as z so it is not confused with 2. 36 CliffsQuickReview Algebra I Set Theory A set is a group of objects, numbers, and so forth—{1, 2, 3}. An element is a member of a set. 3 ! {1, 2, 3}. 3 is an element of the set of 1, 2, 3. Special sets A subset is a set within a set—{2, 3} 1 {1, 2, 3}. The set of 2, 3 is a subset of the set of 1, 2, 3. The universal set is the general category set, or the set of all those elements under consideration. The empty set, or null set, is a set with no members— 4 or { }.

Express algebraically: six more than three times a number n 2 5. Evaluate: 6x y if x = –2 and y = 4 6. Evaluate: a - b - a + b if a = 5, b = –1, and c = 3 c 2 Answers: 1. {2,4} 2. {3, 4, 5, 6, 7} 3. False 4. 3n + 6 5. 96 6. 0 39 Chapter 4 EQUATIONS, RATIOS, AND PROPORTIONS Chapter Check-In ❑ Axioms of equality ❑ Solving equations ❑ Solving proportions for value with variables and solving equations are often considered the basis of algebra. Working Equations An equation is a mathematical sentence, a relationship between numbers and/or symbols.

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? 2. 30 is 20% of what number? 3. What number is 30% of 50? ) 32 CliffsQuickReview Algebra I Scientific Notation Very large or very small numbers are sometimes written in scientific notation. A number written in scientific notation is a number between 1 and 10 multiplied by a power of 10. Example 29: Express the following in scientific notation.

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