What is the solution to the system of equations? y = 1.5x – 4y = –x(–1.6, 1.6)(–1.5, 1.5)(1.5, –1.5)(1.6, –1.6)

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?