Let B(t) be the number of US $20 bills in circulation at time t. The table gives

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Let B(t) be the number of US $20 bills in circulation at time t. The table gives values of this function from 1990 to 2010, as of December 31, in billions. Interpret and estimate the value of B′(2000).

t...............................................B(t)

1990........................................3.45

1995........................................4.21

2000........................................4.93

2005........................................5.77

2010.........................................6.53

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