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Numerical
[table] 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 seconds intervals for 30 seconds. Determine the average rate of change of the surface area of the ball for the interval between 20 seconds and 30 seconds. | [/table]
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To start, identify the two time points for the interval: 20 seconds and 30 seconds, and read off the corresponding surface areas from the table.
At t = 20 s, A = 1266.0 cm^2.
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