HELP PLEASE
evaluating piecewise Function

Which inequality comparing two of the expressions is true when 0.7 < x < 0.9

Solve the equation -9p - 17 =10 a -3 b. 16 c. 18 d -16

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?