# 159E2-F2009 - MA 15900 EXAM 2 FALL 2009 1 Find an equation of the line that passes through the points A(4-2 and B-3,7 1 y = 9 x 6 7 2 y = 9 x 170 7

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MA 15900 EXAM 2 FALL 2009 1 1. Find an equation of the line that passes through the points A (4, 2) and B ( 3,7) . 1) y = 9 7 x + 6 2) y = 9 7 x + 10 7 3) y = 9 7 x + 22 7 4) y = 9 7 x 12 5) y = 9 7 x + 46 7 6) y = 9 7 x 50 7 7) y = 7 9 x + 7 3 8) y = 7 9 x + 9 9) y = 7 9 x + 9 2. Solve the equation. 2 x 4 5 x 3 + 20 x 2 = 0 1) x = 2,5 2) x = 5 2 ,4 3) x = 5 4 ± 3 4 15 i 4) x = ± i , ± 5 5) x = ± 2, ± 1 2 10 i 6) x = 0 7) x = 0, 8) x = 0, 5 2 9) None of the above 3. Find the center and radius of the circle with the following equation: x 2 + y 2 10 x + 8 y 40 = 0 . 1) C (10, 8), r = 2 10 2) C (10, 8), r = 9 3) C (10, 8), r = 40 4) C (10, 8), r = 81 5) C (5, 4), r = 2 10 6) C (5, 4), r = 9 7) C (5, 4), r = 40 8) C (5, 4), r = 81 9) None of the above

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MA 15900 EXAM 2 FALL 2009 2 4. A home owner is deciding which type of windows to buy. Type A windows cost \$4000 and will have \$500 in energy costs per year while Type B windows cost \$6000 and will have \$300 in energy costs per year. Which of the following describes a period of time that using Type B windows will be more economical than Type A windows? 1) more than 2 years, but less than 3 years 2) more than 3 years, but less than 4 years 3) more than 4 years, but less than 5 years 4) more than 5 years, but less than 6 years 5) more than 6 years, but less than 7 years 6) more than 7 years, but less than 8 years 7) more than 8 years, but less than 9 years 8) more than 9 years, but less than 10 years 9) more than 10 years, but less than 11 years 5. The amount of heat H (in joules) required to convert one gram of a liquid into vapor is linearly related to the temperature T (in ° F) of the atmosphere. At 100 ° F this conversion takes 400 joules, and each increase of temperature of 5 ° F lowers the amount of heat needed by 15 joules.
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159E2-F2009 - MA 15900 EXAM 2 FALL 2009 1 Find an equation of the line that passes through the points A(4-2 and B-3,7 1 y = 9 x 6 7 2 y = 9 x 170 7

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