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What is the reference angle for 7pi/6

A. Pi/6
B. Pi/4
C. Pi/3
D. 5pi/6
E. Pi

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

The anwser cause i do not understand just plez

Layla answer 21 of the 25 questions on his history test correctly.what decimal represents the fraction of problem he answer incorrectly.