Determine which equation is parallel to line JK and which is perpendicular to line JK. 6x + 10y = 11

5x + 3y = 13

5x − 3y = 8

6x − 10y = 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?