lesson30outline

lesson30outline - MA 153 RLesson 30 Outline Quiz...

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MA 153 R Lesson 30 Outline Quiz Solutions (Practice problems for distance learning students) 1. Find all the values that would be included on the top of the sign chart for: () 21 0 5 xx x +− + Would need 2,1, and 5 x = −− on the top of the sign chart (Do NOT solve) 2. Solve the inequality (a sign chart has been started for you): 2 34 0 −+ < 3 4 + + + - + + - + + −∞ ( ) 2 3 x 4 x + Result ( ) ,4 −∞− Answering of homework questions over lesson 29. Lesson 30 Section 4.6 Variation k =constant of proportionality (1) "y varies directly as x" or "y is directly proportional to x" ⇒= yk x (2) "y varies inversely as x" or "y is inversely proportional to x" k y x
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Example: Express as a formula and find : k y varies directly as the square root of . If x 4,then 32 xy = = . Example: q is directly proportional to the product of and and inversely proportional to the square of t . x s (a) Express in terms of q ,,, a n d xst k . (b) If , then 2, 3,and 10 xs t == = 6 q = − . Find q when 1, 4,and 3 x st = .
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Page 270: #16 The intensity of illumination, I , from a source of light varies inversely as the square of the distance,
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lesson30outline - MA 153 RLesson 30 Outline Quiz...

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