Please use the following image below in order to answer the question correctly:

In the diagram, ⊙R≅⊙S.
Find m DE⌢. (The symbol is in the image below)

What is the degree measurement of m DE? (Again the symbol is in the image below)

Please show all of the work on how you got your answer.

You don't not need to explain if you aren't able to. All I want is the work on how you got your answer.

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?