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# 17. An equation for a cross section of a flashlight's parabolic reflector can be modeled by ya - 6x. The light bulb is at the focus of the parabolic

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17. An equation for a cross section of a flashlight's parabolic reflector can be modeled by ya - 6x. The light bulb isat the focus of the parabolic reflector. What is the focus?18. Write an equation of a parabola that has its vertex at (3, -2) and directrix with the equation x = 1.19. The height, h, in feet, of a baseball tossed straight up into the air is modeled by theequation h = -16x3 + 16x + 5, where x is the number of seconds after the ball was tossed. This equation canbe transformed into an equivalent form y = -16(x - 0.5)? + k, where k is the maximum height, in feet, of thebaseball. What was the maximum height of the baseball?20. Factor: 8x3 - 1.321. Factor: 5x4 + 40x.of the rectangle.22. A rectangle has a width of x and a length of 3x2 -5x - 7 . Write the expression to represent the perimeter23. Find (x6 + 2x* +x2) -(-x6+ 5x*+x2 -x).224. Divide (3x] - 4x2 + x - 16) + (x - 2) by long division.