If you're driving 30 miles per hour how many hours does it take to drive 60 miles?

Given the graphed function below which of the following orders pairs are found on the inverse function

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?

Can someone me and explain..will award brainlest!