If f(x)=x+9 and g(x)=x-9,
a) f(g(x))=
b) g(f(x))=
c) thus g(x) is called an function of f(x)

- (2, -7)

- lines r and s and lines t and u must be parallel

false

step-by-step explanation:

the reason i say this is because for a certain length of sides you can pick any two and the length is wither equal or greater than the third side and in this case it's not.

3 + 5 = 8

8 is smaller than 9 which is the third side.

hope this : )