Select the system of equations that would be used to solve the following situation. The coast of 12 oranges and 7 apples is $5.36. eight oranges and 5 apples coast $3.68. find the coast of each.

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?