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Assessment as Learning Chapter1 MCV4U 1. As air is pumped into an exercise ball, the surface area of the ball expands. The table shows the surface area of the ball at 2-s intervals for 30 s. Time (s) Surface Area (cm?) O 10.0 2 22.56 4 60.24 6 123.04 8 210.96 10 324.0 12 462.16 14 625.4 16 813.8 18 1027.4 20 1266.0 22 1529.8 24 1818.6 26 2132.6 28 2471.8 30 2836.0 a) Which is the dependent variable and which is the independent variable for this problem? In what units should your responses be expressed? Text b) Determine the average rate of change of the surface area of the ball for each interval. i) the first 10 s ii) between 20 s and 30 s iii) the last 6 s