quiz1-8.40-soln. - graph is a straight line which decreases...

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MATH 101-B Fall 2004 Quiz 1 ( 8:40-10:30 Group) Oct. 1, 2004 Time: 10 minutes Name: Student No: Follow the directions. No work No credit!! Problem 1 (5 pts. each) The temparature of a room is 20 C initially and it is decreasing by time due to bad heating. Write a formula for the temparature T in C at time t (in minutes) in each of the following cases. Sketch their graphs. a. T decreases 0.4 C every minute. b. T decreases by 3% a minute. Solution: a. The formula is T t ± 20 ± 0.4 t , which is a linear function. Therefore its
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Unformatted text preview: graph is a straight line which decreases. 75 62.5 50 37.5 25 12.5 25 20 15 10 5-5 t (min) T (C) Graph of T & t ± & 20 ± 0.4 t b. The formula is T & t ± & 20 1 ± 3 100 t & 20 & 0.97 ± t , which is an exponential function. It is a decreasing function since the base value is ± 1. 100 75 50 25 30 25 20 15 10 5 t (min) T (C) T (C) Graph of T & t ± & 20 & 0.97 ± t...
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This note was uploaded on 03/24/2012 for the course MATHEMATIC 101 taught by Professor Many during the Spring '10 term at Sabancı University.

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