If f(x)=2x+1 and g(x)=x-3, find f(g(f(x)))

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

Which expression is rational? 6. , square root two, square root 14, square root 49