Solve for x: −4|x + 5| = −16
a. x = 21 over 4, x = −11 over 4
b. x = −1, x = 9
c. x = −1, x = −9
d. no solution

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?