Who's ur favorite song artist?

Find the slope of a line given the following two points

In a certain city, the hourly wage of workers on temporary employment contracts is normally distributed. the mean is $15 and the standard deviation is $3. what percentage of temporary workers earn less than $12 per hour? a. 6% b. 16% c. 26% d. 36%

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top