Write an exponential equation in the form y = abx whose graph passes through points (4, 8) and (6, 32). y = 0.5(2)x y = 4(8)x y = 2(0.5)x y = (0.5)x

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?