hellooo , i need help in them asap pleasee

What is the domain of f(x)=-3x+9? Question 15 Not yet answered Marked out of 5.00 a. X-3 b. X3 2x+4 The domain of f(x)= x-x-2 is: Question 16 Not yet answered Marked out of 5.00 Flag question a. All real numbers greater than or equal to -4 except -1 and 2 b. All real numbers except -1 and 2 c. None d. All real numbers greater than or equal to -2 except -1 and 2 e. All real numbers greater than to-2 except -1 and 2