What type of slopes do parallel lines have? and, what type of slopes do perpendicular lines have?

Given a(-12,5) and b(12,29) find the point that divides the line segment ab three-eighths of the way from a to b

Need this asap if anyone can i would be very grateful. if you could show workings that would really

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%