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pls help-

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?

What is the domain of the of the exponential function shown below?

Zack and tia played chess for 50 min they put the chessboard away at 11: 20 when did they start