There are 714 boys in 'your' school, just cross multiply and divide to find your answer. x / 1309 = 6/11 is your formula; 1309 times six is 7854, then divide your product (7854) by 11 to get 714 as x or the number of boys.
F(x) = g(x) 3(2) - 4 = (2)² - 2 6 - 4 = 4 - 2 2 = 2 I just substituted all the values in the domain to see which one would work. That's not really the quickest way but that's the only way I know