Nursing Preparation Study Guide

Nursing Preparation Study Guide

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Step 3: Divide both sides by 2 2 2 < 14 2 Step 1: Divide both sides by 5 5 5 ≤ 25 5 Step 1: Add 5 to both sides – 5 + 5 ≥ 17 + 5 Step 1: Subtract 10 from both sides −2 + 10– 10 < 64– 10

5 ≤ 25 ≤ 5 – 5 ≥ 17 ≥ 22

−2 + 10 < 64 −2 < 54

> −27

Step 2: Divide both sides by ( −2 ) & reverse the inequality sign − 2 −2 > 54 −2

3.5.6 Ratios and Proportions A ratio is a comparison between two different things. For example, a ratio of the number of students who are late to class compared to the number of students who are on time. If 5 students are late and 15 students are on time the ratio would be 5:15 or 5 to 15 or > <> . Ratios can be written in a variety of ways. Proportions are defined as two ratios that are equal to each other. Examples: ~  = €  or a:b = c:d. When two ratios are equal we can cross multiply the ratios to solve for an unknown value. For example, 3 5 = 35 Cross-multiply and so, 5( ) = 3(35) 5 = 105 ⟹ = 21 Another type of special ratios are unit rates. A unit rate is a ratio (usually different units) expressed as a quantity of one. E.g., a 3 pound bag of sugar costs $3.99, but howmuch are you paying per pound?

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