Question

I have 6 questions that I need checked If anyone can help.
I'll post 'em one at a time below. I'm REALLY confused. ; n;

Answer 1

If it has an answer check/bulleted, does that mean that's the one you think is correct?

Answer 2

I answered some of them, I don't know if the ones I did answer are right tho, and the one's I didn't answer, If yhu could walk me through how to do it, that would be awesome.

Answer 3

That first one looks correct.

Answer 4

Awesome! ^.^
Here's the second one. This one requires one or more answers.

Answer 5

The second one, the domain goes to infinity and negative infinity, so it covers all real numbers. the range is greater than or equal to 0. so the first box and last box. Let me know if you have questions on why.

Answer 6

Could yhu explain?

Answer 7

Sorry I was away from my computer. So the domain relates to the x-axis. If you zoomed out, the line keeps extending to the left and the right. If x=1,000,000 you could plot that. no matter how far you go to the left or how far you go to the right, there is still a point on the line for x.
the range is for the y axis. for x=1, y=0. No matter what point you pick for x, you cannot have a negative y. Does that make sense?

Answer 8

OH!
Yes, it does.

Answer 9

Are yhu ready for the third question?

Answer 10

sure

Answer 11

I didn't understand this one.

Answer 12

Yeah, this one is a little tougher.ok, so x relates to domain. f(x) relates to y (kind of...that's the easiest way to think about it). It gives you the points for x (-2, -1, 0, and so on). That top row is your x or domain and the bottom row is the range. You put in x and get out f(x). f(-2)=5. You put in -2 and get 5. The only one is the second one from the options. If any of this is confusing let me know. It's harder to explain over the computer.

Answer 13

So... f(x) would be any of the top numbers... The x's? ... And what yhu get out... Is the bottom number?

Answer 14

yep. so the x on the top row, is the x in the f(x). If you put in -2, the x would change to f(-2).

Answer 15

So.... Would the last 3 options be right?

Answer 16

Oh, it's actually the second and last, not just the second. It wouldn't be the third because if you plotted them, it wouldn't be a line, it would be points.
Check out this site, it might explain it better
https://www.khanacademy.org/math/algebra/algebra-functions/domain_and_range/v/domain-and-range-of-a-relation

Answer 17

That helped a lot. :D

Answer 18

khan academy is a great website for math. I'm on there quite a bit watching videos and doing problems.

Answer 19

I've heard it was a good site to go to but for like... Practicing different equations and stuff.
Here's the fourth question.

Answer 20

\[f(x)=\frac{ (3+x) }{ (x-3) }~~~~~~~~~f(a+2)=\frac{ (3+(a+2)) }{ ((a+2)-3) }\]
That's basically what that one is saying. The one on the left is the start and the one on the right is what happens when you put a+2 in for x. You'll have to do the algebra, but that's a start. I can verify the answer if you're not sure about it.

Answer 21

So all yhu had to do was plug (a+2) in for x?

Answer 22

Yep

Answer 23

I'm not sure how this works into the answers, after plugging that in, do yhu solve it?

Answer 24

Yeah, just add like terms.

Answer 25

It would be B right? 3+2 on top leaves yhu with 5+a and 2-3 on the bottom leaves yhu with -1+a

Answer 26

Yep, nice job.

Answer 27

That was so easy! Oh my gosh. >u<

Answer 28

Before we move onto number 5, If they give me x in all the future f(x) problems, Would I plug it in like I did for this one?

Answer 29

Yep. It get's more confusing as you go. Just double check your work. It's easy to get things mixed around

Answer 30

So for question 5, it would be the first and that last one. So for it to be a function, there can only be 1 value for an x term. For this one if you plug 3 in for x, you'd get f(3), but it doesn't equal one number. 3 can be 1, 2, 3, 4, 0, -1 so it's not a function.

Answer 31

Oh, I remember going over that, yhu can have two x functions but not two y's right?

Answer 32

yep. the vertical line test.

Answer 33

it might also be the 3rd one. i'm not sure on that.

Answer 34

Should I put it just in case. :D
This is the last one.

Answer 35

Yeah, I think it's correct.

Answer 36

Awesome! ^.^
Thank yhu so much for all yhur help!

Answer 37

Oh wait, hang on with that last one

Answer 38

sorry, i meant I think it's correct for question 5. it should be the 3rd one also.

Answer 39

the last one is C.

Answer 40

Yhur the best. ^u^ I got 100.
Thank yhu for walking me through how to do those.

Answer 41

Yep. It helps me out too just going over those types of questions again. Good luck this year.