I am assuming you meant to write b(x) = x-4.

Since this is a linear function, the domain is all real numbers.
Answer:
2
the answer is 2 coz it's like terms
Is there a problem or something to show for it?
Answer:
Susan has more books than Michael.
Step-by-step explanation:
If Susan has 50% more books and Michael has 40 books, that means Susan has 1.5 times 40 = 60
40 + 8 = 48
60 is more than 48, so Susan has more books than Michael
4,3 x is the first number then y