What is the reference angle for 7π/6

In a school 2/3 of the students study a language of those who study a language 2/5 study french

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles