I'm confused about this, can someone answer?

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.

If a=0.333333 and b=0.55555, what is the value of a+b

The weekly amount spent by a company for travel has an approximately normal distribution with mean = $550 and standard deviation = $40. a) what is the probability that the actual weekly expense will exceed $570 for more than 20 weeks during the next year? (note: one year = 52 weeks) b) what is the probability that actual weekly expenses exceed $580 for 10 or more, but 16 or fewer weeks during the next year?