18. Check the Show h(t) box and click the Time play button to trace the path of the baseball. Use the t-slider to find the maximum height of the baseball. Complete parts 1 and 2 below. Use the interactive figure to find your answer. Use the left and right arrow keys to move along a slider as needed. Click here to launch the interactive figure,1 Part 1: The maximum height occurs when t= seconds . Part 2: The maximum height of the baseball is feet. 1: http://media.pearsoncmg.com/cmg/pmmg_mml_shared/precalc_ifigs_HTML5/IFig1_10Precalc_domain_and_range_height_of_a_baseball/index.html 19. Check the Show h(t) box and use the t-slider to find the height of the baseball when t = 4 seconds. Use the interactive figure to find your answer. Use the left and right arrow keys to move along a slider as needed. Click here to launch the interactive figure.2 When t= 4 seconds, the height h = feet. 2: http://media.pearsoncmg.com/cmg/pmmg_mml_shared/precalc_ifigs_HTML5/IFig1_10Precalc_domain_and_range_height_of_a_baseball/index.html 20. Check the Show h(t) box and use the t-slider to find all the times t the baseball has a height of 64 feet. Use the interactive figure to find your answer. Use the left and right arrow keys to move along a slider as needed. Click here to launch the interactive figure, 3 seconds (Type integers or decimals. Use a comma to separate answers as needed.) 3: http://media.pearsoncmg.com/cmg/pmmg_mml_shared/precalc_ifigs_HTML5/IFig1_10Precalc_domain_and_range_height_of_a_baseball/index.html 21. Check the x-intercepts and Vertex boxes. Use the h and k-sliders to graph a quadratic whose vertex is at (3, - 8). Adjust the a-slider until one x-intercept is (5,0). What are the coordinates of the second x-intercept? Use the interactive figure to find your answer. Use the left and right arrow keys to move along a slider as needed. - Click here to launch the interactive figure,4 The coordinates of the second x-intercept are . (Type an ordered pair.) 4: http://media.pearsoncmg.com/cmg/pmmg_mml_shared/precalc_ifigs_HTML5/IFig1_23Precalc_graphs_of_quadratic_functions/index.html 22. Check the Vertex box. Use the h and k-sliders to graph a function with vertex (3, - 4). Check the x-intercepts box and use the a-slider to graph various quadratics with this vertex. When a function has a vertex in the 3rd or 4th quadrant and no x-intercepts, the value of a must be which of the following? Use the interactive figure to find your answer. Use the left and right arrow keys to move along a slider as needed. Click here to launch the interactive figure, 5 Choose the correct answer below. OA. a=0 OB. a >o OC. aco