The mean yearly rainfall in Sydney, Australia, is about 137 mm and the standard deviation is about 69 mm ("Annual maximums of," 2013). Assume rainfall is normally distributed. c. If a year has a rainfall less than 100mm, does that mean the year is an unusually dry year? Why or why not? Do not use the word "it" in your reason for why or why not.

If (a, b) is the solution to the system of equations shown above, and a and b are integers, then what is the value of a+b?

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Sat no calculator section question in the picture