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Do Now: Solve for x:

Do Now: Solve for x:. WHEN MULTIPLYING OR DIVIDING BY A NEGATIVE, REMEMBER TO REVERSE THE INEQUALITY SIGN!!!. Solution:. or. Using interval notation:. Parenthesis does not include the endpoint. Bracket includes the endpoint. Infinity never gets a bracket.

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Do Now: Solve for x:

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  1. Do Now: Solve for x: WHEN MULTIPLYING OR DIVIDING BY A NEGATIVE, REMEMBER TO REVERSE THE INEQUALITY SIGN!!! Solution: or Using interval notation: • Parenthesis does not include the endpoint. • Bracket includes the endpoint. • Infinity never gets a bracket.

  2. Solve for x and show your answer in interval notation and on a number line:

  3. HW p. A73 # 55,56 Solving Quadratic Inequalities algebraically: Consider two cases: I. Quadratic > 0 II. Quadratic < 0

  4. HW p. A73 # 55,56 Solve the Quadratic Inequality algebraically:

  5. HW p. A73 # 55,56 Since we want the inequality to work for all values of that are below 7, we want all the values between the left and right POI’s (See shaded region). Thus the solution is: Solving Quadratic Inequality graphically:

  6. HW p. A74 #81, 83 Quadratic Inequality Application: A projectile is fired straight upward from ground level with an initial velocity of 384 feet per second. During what time period will its height exceed 2000 feet? The position of an object moving vertically can be modeled by the position equation: s is the height and t is the time. In this case s0 = 0, v0 = 384, and s must be greater than 2000 so:

  7. HW p. A74 #81, 83 You must adjust the Zoom and Window settings to get a clear picture of the intersection of the 2 graphs. Try Zoom Fit and change the Window settings as indicated in the image:

  8. HW p. A74 #81, 83 SOLUTIONS TO HOMEWORK PROBLEMS (Quad Ineq. Apps) • #81: A projectile is fired straight upward from ground level with an initial velocity of 160 feet per second. • At what instant will it be back at ground level? • When will the height exceed 384 feet? (a) When the projectile is at ground level the height, s, is zero. We are finding t when s = 0. Range of t values when the height of the projectile is above 384 (b)

  9. HW p. A74 #81, 83 SOLUTIONS TO HOMEWORK PROBLEMS (Quad Ineq. Apps) #83: The numbers D of doctorate degrees (in thousands) awarded to female students from 1990 to 2003 in the US can be approximated by the following model, where t is the year, with t = 0 corresponding to 1990: • Use a graphing utility to graph the model

  10. (b) Use the zoom and trace features to find when the number of degrees was between 15 and 20 thousand. The blue line indicates the interval where the curve is between the 15 and 20

  11. (d) According to the model, will the number of degrees exceed 30 thousand? If so, when? If not, explain. (c) Algebraically verify your results from part (b) Show using a number line why the solution is:

  12. Use the models which approximate the annual numbers of hours per person spent reading daily newspapers N and playing video games V for the years 2000 to 2005, where t is the year, with t = 0 corresponding to 2000.

  13. Review the 4 situations when dealing with conjunctions and disjunctions:

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