URGENT
The range of the function f(x) = x + 5 is {7, 9}. What is the function’s domain?
A) {2, 4}
B) {-2, -4}
C) {12, 14}
D) {-12, -14}
E) {0, 5}

Question

anonymous · Answer

The range is the f(x) or y value so you need to solve these equations to find the domain.

$$x+5=7$$
$$x+5=9$$

anonymous · Answer

so is {2,4}????? @peachpi

texaschic101 · Answer

first, sub in 7 for x in f(x) = x + 5

texaschic101 · Answer

f(x) represents y...and the y values are your domain.
so what is y in this first equation ? 
f(x) = 7 + 5......is the same as y = 7 + 5...

do the same for the other one...
f(x) = x + 5....when x = 9...and remember f(x) = y..
y = 9 + 5...so what is y ?

anonymous · Answer

now I understand!! so the anwser is {12,14}??? @texaschic101

anonymous · Answer

it's {2,4}