ANSWER
A) -20x²+14x+12; all real numbers
EXPLANATION
The give functions are;

and





This is a polynomial, hence the domain is all real numbers.
The first one is not proportional and the second one is proportional.
S what you do is 10,911-8,848=2063 so 2063 is the difference. the reason i subtracted is because difference also means subtract <span />