Which equation is an identity? O3(2-1) = x + 2(x + 1) + 1
02-4** 1) = 360* 1) + 1
O 2*3 = (4x+ 2) + 2
(ar – 3) = 3(x + 1) – 2-2

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?