Solve these please using an answer key

7. Describe the characteristics of the trend in the data. 2 5 8 10 12 14 17 20 135 120 115 102 92 85 78 64 A. increasing B. decreasing C. constant D. no trend 8. Determine the equation of the linear regression function for the data. 2 5 8 10 12 14 17 20 135 120 115 102 92 85 78 64 A. y= 135 -5x B. y= 139.5 - 4.5x C. y= 141.8 -3.9x D. y=142.7-3.2x 9. The path of a shot put thrown at a track and field meet is modelled by the quadratic function h(d) =-0.048(d' -20.7d -26.28) where h is the height in metres and d is the horizontal distance in metres. Determine the height of the discus when it has travelled 10 m horizontally. A. 6.2 m 6.4 m C. 6.6 m D. 6.8 m 10. Determine the equation of the cubic regression function for the data. 2 4 7 10 12 13 17 19 135 120 105 102 99 88 78 47 A. y = 0.05x3 - 1.5x2 - 16x + 162.5 B. y=-0.05x3 + 1.5x2 - 16x + 162.5 C. y = 0.05x3 + 1.5x2 + 16x - 162.5 D. y =-0.05x3 + 1.5x2 + 16x -162.5