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Corrections to problems in Modeling, Functions, and Graphs – Algebra for College Students by Franklin/Drooyan Ch 1 Review: #49 form of answer is not expanded. It should be: a b 2 a 2 2ab b 2 2a 2b 4 Section 2.5: #89 exact answer is 8.415789 10 2 Ch 2 Review: #55 Some books have y 1 in the denominator of problem instead of y 1 Section 3.1: #73 175 is between 13 and 14, not 12 and 13. Section 3.2 #89 the exponent of –1/2 should be –1.2 instead Section 3.4: #13 answer has 4 x 2 in it which simplifies to x Section 4.1 #69 answer should be 293 hours 3 , 3 ,1,1 Section 4.5 #57 some books don’t have all solutions: Cumulative Review of Part 1: #34 answer should be y y 3 2( y 3) Section 5.1 #3(b) answer should be 52 Section 5.4 #21 book used the points 4,20 and 6,60 to get estimate #27(d) answer is parallel, not perpendicular Ch 5 Review: #30 answer is 5 x 2 y 16 Section 6.5 #25 vertex isn’t graphed high enough Ch 6 Review #18 in some books they write “2” as “z”. it should be “2” #31 to get answer in back of book, change problem to: x3 , if x 1 S ( x) x, if x 1 Section 7.1 #3 shape of the graph is a bit funky 3 #43 answer should be: y x 3 1 Section 7.2 #13 first answer is 6.2928 and second answer is 142.4442 Section 7.3 #9 graph should look like: Section 7.5 #7 answer should be: f 1 ( x) 3 2 x Ch 7 Review: #20 graph should look like: #44 problem should say: find G 1 (3) Section 8.1 #15(b) answer is 46.1 pounds, not 46.7 Section 8.4 #27 answer is about 0.05, not 0.50 Section 8.5 #91 answers are approximately 11.7 years and 11.6 years Section 9.2 #13 some books have “9”instead of “ 9 ” in the third equation: it should be "9" . Section 10.3 #25 answer should be (, 316 ] (4, ) Section 10.4 #7 wrong side of line is shaded – shade other side #35 lines are incorrect – region is a quadrilateral with vertices (0,1), (0,3) ( 332 ,25) and (5,2) 5 181 , Chapter 10 Review #24 answer should be: , 18 Section 11.1 #23 the center is mislabeled – it should be 0,3 Section 12.4 #61 answer is 9/20, not 9/4