Quiz 2 with Answer Key | Calculus I for Business, Life and Social Sciences | MATH 1743, Quizzes of Mathematics

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Math 1743.001 Barksdale Spring 2010 Quiz IT as a worksheet Name: ROW #: Quiz 2 as a Worksheet Please state your answer clearly! The point values for each problem are given. Read the problems very carefully! Label all numeric answers, where necessary! A number is useless without a label or written description! Recall the four necessary elements of a model! 1. The table shows the subscriptions of a city’s newspaper from 1990 through 2000. Year 1990 | 1992 | 1994 | 1996 | 1998 ; 2000 Subscriptions 402 | 463 [523 | 587 | 672 | 780 {in thousands of papers) a.) Find the percent DIFFERENCES. (2 pts) [S172 Fo (2.46%, (2.29%, M48% [6.07 fo b.} Generate a complete exponential model. 6 nan 9) = 402-725( O67) Howell prpera, + gene aftr }9 90. ¢.) How many subscriptions were there in the year 19997? @ pts) S(4)= 722.67) 133 daroacd g «pect d.) When (how many years after 1990, rounded to the nearest tenth) did the subscriptions exceed 1.5 million papers? (2 pts) 4 22702 “uy 54) = [xe ‘ . oR enw oF SHN590 S(Q- (500-0 2000 08 e.) Find the percentage change of the model. (2 pts) , 0 ¢ % Me (ocT-Dl00% 2 4.1% opoe LT 2. A population of 163,000 bacteria is observed to decrease exponentially by 12.7 % each hour after the introduction of a certain anti-bacteria. Find an exponential model for the population of bacteria. (6 pts) a2lb3 b= |=? 813 Lavo pla) = 163 CoB TI Herve Boctens HAE