The domain of a sequence can include decimals and irrational numbers.

No, that's not true.  The input variable of a sequence is called the index, which is a counter, such as 1, 2, 3, 4, ...   Note that all of these counters are positive integers.  Normallly I use index i = 1 to denote the first term of a sequence, i = 2 the second term, and so on.

Decimals and irrational numbers are completely unsuitable for serving as such counters.

hello from mrbilldoesmath!

answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb

y/x of point b= y/x of point a

step-by-step explanation:

(i got the same question, this was the correct answer.)