7) Which equation is true and uses the GCF of 12 and 30?
A) 12 + 30 = 2(6 + 15)
B) 12 + 30 = 3(4 + 10)
C) 12 + 30 = 6(2 + 5)
D) 12 + 30 = 6(2 + 7)

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?