The elevation of a lake surface (feet above sea level) varies according to the annual flow of a river that feeds it. A geological survey provided the following data from equally spaced intervals of time over a 15 year period. Time Period Elevation 1 2795 2797 3 2797 2798 2802 6 2803 2807 2808 2810 10 2811 11 2812 12 2815 13 2816 14 2817 15 2817 Make a time-series graph displaying the data. Elevation Elevation 2840, 2815 2830 2810 2805 2820 2800 2810 2795 2800 2790 2790 2785 Time Time 4 8 10 12 14 Period 2 4 6 8. 10 12 14 Period Elevation Elevation 2815 2815 2810 2810 2805 2805 2800 2800 2795 2795 2790 2790 2785 2785 Time Time 4 8 10 12 14 Period 2 4 8 10 12 14 Period