An online clothing company sells custom sweatshirts. The company charges ​$4.00 for shipping plus ​$8.00 for each sweatshirt. Write a linear function rule that models the total cost y​ (in dollars) for any number of sweatshirts x. Describe how the linear function rule would change if the shipping charge applied to each sweatshirt

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?