Help its not 8/7 but i cant do this one either and also the | | means Absolute value not parentheses

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

What would the rule be for the reflection of y=-3

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?