# SEMINAR 6 TEST 2-answers - Question 31 2.75 points Without...

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Question 31 2.75 points Save Without solving the given quadratic equation, determine the number and type of solutions. 2x 2 = -2x - 3 Two irrational solutions Two imaginary solutions One (repeated) rational solution Two rational solutions 2x 2 = -2x – 3 2x 2 + 2x + 3 = 0 x = [-b± √(b²- 4ac)]/2a x = [-2±√(2²- 4(2)(3))]/2(2) x = [-2+√(4- 24)]/4 x = (-2+√-20)/4 *You cannot square root a negative number.* x = [-2-√(4- 24)]/4 x = (-2-√-20)/4 Question 32 2.75 points Save Solve the problem. The bar graph shows the percentage of students at State University that owned portable MP3 players from 2003 through 2007 with projections for 2008 and 2009. The function f(x) = -0.9x 2 + 16x + 10 models the percentage of students that owned portable MP3 players at State University , f(x), x years after 2003. a. Use the function to find the percentage of students that owned portable MP3 players at State University in 2008 . Does this overestimate or underestimate the percentage in the graph? By how much? b. Use the function to determine the first year in which 77% of students owned portable MP3 players at State University. a. f(x) = -0.9x 2 + 16x + 10 f(5) = -0.9(5) 2 + 16(5) + 10 f(5) = -22.5 + 80 + 10 f(5) = 67.5(under, a or d)

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b. 77 = -0.9x 2 + 16x + 10 0 = -0.9x 2 + 16x -67 x = [-b± √(b²- 4ac)]/2a x = [-16± √((16)²- 4(-.9)(10)]/2(-.9) x = [-16± √(256- 36]/-1.8 x = [-16± √220]/-1.8 x = [-16± 2√55]/-1.8 x = [-16± 14.83]/-1.8 x = -1.17/-1.8=.65, 17.13, IDK but with %s dropping it has to be 2011 a. 67.5%; underestimates by 1.5% b. 201 a. 67.5%; overestim tes by 1.5% b. 2011 a. 67.5%; overestimates by 1.5% b. 2010 a. 67.5%; underestimates by 1.5% b. 2010 Question 33 2.75 points Save Solve the inequality and graph the solution set on a number line.
Question 34 2.75 points Save Solve the problem. April shoots an arrow upward into the air at a speed of 32 feet per

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SEMINAR 6 TEST 2-answers - Question 31 2.75 points Without...

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