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Do (a) by hand & (b) with a calc. a)  EMBED Equation  b)  EMBED Equation  (4.4) DYR3 6) Use a graphing calculator to solve the system of linear equations. (4.5) 4x y + z = 18 2x + 2y + 3z = 19 5x 2y - 2z = 2 7) Find the discriminant and determine the number of real solutions. (5.4)  EMBED Equation  = 0 8) Find the inverse of the function: (6.3) f(x) =  EMBED Equation  9) Simplify Completely: a)  EMBED Equation  b)  EMBED Equation  c)  EMBED Equation  (7.4) 10) Solve for x:  EMBED Equation  = 22 (7.5)  ANSWERS  1) det: matrix math det: dis: b2-4ac 2) $7 for a CD $14 for a movie 3) 4a) 28 4b) 0, because the sides do not form a (. 6) (2,-3,7) 7) 0, 1 8) y =  EMBED Equation  9a)  EMBED Equation  9b)  EMBED Equation  9c)  EMBED Equation  10) x = 5 DYR3 11. Simplify each expression as much as possible. Remember to rationalize the denominator if necessary. a.  EMBED Equation.3  b.  EMBED Equation.3  c.  EMBED Equation.3  d.  EMBED Equation.3  e.  EMBED Equation.3  12. Evaluate  EMBED Equation.3  for the following values of x: a. x = -2; f(x) = _____ b. x = 1.3; f(x) = _____ c. x = -2.3; f(x) = _____ 13 If f(x) = x2 -2 and g(x) = x + 2, find each of the following: a. (f(g)(x) b. (g(f)(x) c. (f-g)(x) d. (f(g)(-2) e. (g(f)(4) f. (fg)(2) 14 Find the equation for a parabola that has vertex (-3, 5) and passes through the point (2, -8). _________________________ DYR3 15 Sketch the graph: y = 2x2(x-a)3(x-b)(x-c)4. 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