For f(x) = 3x +7 and g(x) =2x, find the following composite functions and state the domain of each. (a) fog (b) gof (c) fof (d) gog (a) (fog)(x) =] (Simplify your answer.) Select the correct choice below and fill in any answer boxes within your choice. O A. The domain of fog is {x } (Type an inequality. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.) O B. The domain of fog is all real numbers. (b) (g of)(x) =] (Simplify your answer.) Select the correct choice below and fill in any answer boxes within your choice. O A. The domain of g of is {x |} (Type an inequality. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.) O B. The domain of g of is all real numbers. (c) (f o f)(x) = (Simplify your answer.)For f(x) = 3x + 7 and g(x) =2x, find the following composite functions and state the domain of each. (a) fog (b) gof (c) fof (d) gog needed.) O B. The domain of g of is all real numbers. (c) (f o f)(x) = (Simplify your answer.) Select the correct choice below and fill in any answer boxes within your choice. O A. The domain of fof is (x } (Type an inequality. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.) O B. The domain of f of is all real numbers. (d) (gog)(x) = (Simplify your answer.) Select the correct choice below and fill in any answer boxes within your choice. O A. The domain of gog is {x } (Type an inequality. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.) O B. The domain of gog is all real numbers