I completely forgot how to do this stuff

When only separate discreet points are graphed it is called?

Aline passes through the point (–7, 5) and has a slope of 1/2 which is another point that the line passes through?

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?