For f(x)=3x+2 and g(x)=7x, find the following composite functions and state the domain of each. (a) fog (b) g of (c) fof (d) gog OA. 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.) B. The domain of fog is all real numbers. (b) (gof)(x)=21x+14 (Simplify your answer.) Select the correct choice below and fill in any answer boxes within your choice. 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.) B. The domain of g of is all real numbers. (c) (fof)(x)=9x+8 (Simplify your answer.) Select the correct choice below and fill in any answer boxes within your choice. OA. The domain off of is {x}. (Type an inequality. Use integers or fractions for any numbers in the expression. Use a comma to separate answers as needed.) B. The domain of f of is all real numbers. (d) (gog)(x)=49x (Simplify your answer.) Select the correct choice below and fill in any answer boxes within your choice. OA. 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.) The domain of gog is all real numbers.