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Unformatted text preview: Math 105 First Midterm February 9, 2010 Name: Instructor: Section: 1. Do not open this exam until you are told to do so. 2. This exam has 11 pages including this cover. There are 7 problems. Note that the problems are not of equal difficulty, so you may want to skip over and return to a problem on which you are stuck. 3. Do not separate the pages of this exam. If they do become separated, write your name on every page and point this out to your instructor when you hand in the exam. 4. Please read the instructions for each individual problem carefully. One of the skills being tested on this exam is your ability to interpret mathematical questions, so instructors will not answer questions about exam problems during the exam. 5. Show an appropriate amount of work (including appropriate explanation) for each problem, so that graders can see not only your answer but how you obtained it. Include units in your answer where that is appropriate. 6. You may use any calculator except a TI92 (or other calculator with a full alphanumeric keypad). However, you must show work for any calculation which we have learned how to do in this course. 7. If you use graphs or tables to find an answer, be sure to include an explanation and sketch of the graph, and to write out the entries of the table that you use. 8. Turn off all cell phones and pagers , and remove all headphones. Problem Points Score 1 9 2 10 3 18 4 17 5 12 6 16 7 18 Total 100 Math 105 / Exam 1 (February 9, 2010) page 2 1 . [9 points] For each of the functions below, determine which of the listed attributes could be true for the function on the entire given domain. Circle all the attributes that could be true, and if none of the listed attributes can be true, circle NONE OF THESE . a . [3 points] x 1 2 3 4 f ( x )3.74.25.47.5 f ( x ) could be LINEAR EXPONENTIAL INCREASING DECREASING CONCAVE UP CONCAVE DOWN NONE OF THESE b . [3 points] x1 1 2 h ( x ) 3 6 12 24 h ( x ) could be LINEAR EXPONENTIAL INCREASING DECREASING CONCAVE UP CONCAVE DOWN NONE OF THESE c . [3 points] A spectator buys a cup of coffee one morning at the Winter Olympics. The coffee cools off very rapidly at first, but then it cools off more slowly as its temperature gets closer to that of the coffee shop. C ( t ) is the temperature of the coffee t minutes after it was poured. C ( t ) could be LINEAR INCREASING DECREASING CONCAVE UP CONCAVE DOWN NONE OF THESE Math 105 / Exam 1 (February 9, 2010) page 3 2 . [10 points] The graphs of a linear function L and an exponential function G are shown below. (Not necessarily drawn to scale) x P ( 2 , 4) y y = G ( x ) y = L ( x ) 1 a . [4 points] Find a formula for L ( x ). (All numbers should be exact.) Answer: L ( x ) = b . [2 points] Find the coordinates of the point P . (All numbers should be exact.) Answer: c . [4 points] Find a formula for G ( x ). (All numbers should be exact.) Answer: G ( x ) = Math 105 / Exam 1 (February 9, 2010) page 4 3 . [18 points] Use the functions....
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 Fall '08
 Rhea
 Math

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