I need help with this

If f(x)=2x+2and g(x)=x^3, what is (g•f)(2)

Given that y varies directly to the square root of (x + 1), and that y = 1 when x = 8,(a)express y in terms of .x,(b)find the value of y when x = 3,(c)find the value of x when y = 5.

What is the sum of these mixed numbers 4 2/3+ 3 1/9