I typed in 66.67 % but it said it was wrong. What is the answer

Asquare parking lot has 6,400 square meters what is the length in meters

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?