Math111i_Quiz3_Solutions

# Math111i_Quiz3_Solutions - s = 9 t 45 Math 111I Sec 001...

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Math 111I Sec 001 Quiz 3 Name Directions: Read each question carefully and answer in the space pro- vided. The use of calculators is allowed, but not necessary. There are 10 points possible. To receive partial credit on any problem work must be shown. 1. (5 points) Find a linear equation that describes the statement: A Car starts traveling at 45 mph and its speed is increasing by 9 mph each minute. Write your answer in slope-intercept form, s = b + mt , in terms of speed, s and time (in minutes), t . Solutions. If we think about it the car begins traveling (i.e. the time is 0 t = 0) with a speed of 45 mph. That means that s = 45 when t = 0 so we have that the value for b = 45. The slope is given by increasing speed at 9 mph/min. Thus we have that the equation that we are looking for is

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Unformatted text preview: s = 9 t + 45 . Math 111I Sec 001 Quiz 3 2. (5 points) Given the following plot and that the lines are dotted, dashed, or solid. Tell me which line has the largest slope. And which line has the largest y-intercept. Give approximate numbers for each of your answers. Solutions. The solid line has the largest slope. Because if we compute m solid = 5-2 1-= 3 m dashed =-3-(-2)-1 = 1 m dotted = 5-4-2 =-1 2 . The y-intercepts follow. For the solid line the y-intercept is 2, for the dashed line the y-intercept is-3 and for the dotted line the y-intercept is 5. Thus, the dotted line has the largest y-intercept....
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