PLEASE ILL MARK BRAINIEST 1.) 5(y+3)-3x2 when x=4 and y=2

2.)2x2-2(x+4) when x equals 5

3.) (4x2-10)/6 when x equals 5

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?