Question

OK, now I won't post a smile, if moderators think it is worse than a dot or a comma.
I need help with an SAT question.

If f(3) = 15 and f(5) = 45, which of the following could be f(x)?

A. 4x + 3
B. 2x² – 2x
C. 2x² - x
D. 2x² - 5
E. 5x²

Answer 1

plug in the values.

Answer 2

4(3) + 3 = 15
4(5) + 3 = 23
so you can cross off A.

Answer 3

cross off A?

Answer 4

I see!

Answer 5

2(3)^2 - 2(3) = 18 -6 = 12
so it's not B either.

Answer 6

and just keep plugging in points till i get the right answer?

Answer 7

yes

Answer 8

C

Answer 9

its obviously not D either

Answer 10

C

Answer 11

process of elimination is best sometimes when you are given choices

Answer 12

yeah

Answer 13

Yeah! Someone helped! @shamil98, ty!

Answer 14

2(5)^2 - 5 = 45
2(3)^2 - 5= 15
yeah, np.

Answer 15

I have a different question, why did a moderator issue me when I posted a smile?

Answer 16

Was there a question in the replies?

Answer 17

It could be because it was irrelevant to the Mathmematics section, off-topic.

Answer 18

No, I pereviously posted a q, wanting to ask this, but Arving came, whatever his name is, and closed it.

Answer 19

I didn't know you could post a smilie. I always use :-)

Answer 20

some people post dots, and why is a dot more relevant than smile?

Answer 21

you could
(•‿•)

Answer 22

For that then just ask that moderator or another mod about it.

Answer 23

Yeah, and they are going to warm me of being suspicious.
then will find something to stick to, idc, you helped me, that;s good enough.

Answer 24

You can always try this ☺

Answer 25

Cool

Answer 26

you could plug x = 5 and x = 3 into the equations and see if it comes up with the result

Answer 27

Everyone! I just fanned @shamil98 andf @wolf1728!
You deserve it!!!

Answer 28

that 2

Answer 29

Well thanks !!! ☺

Answer 30

Anytime, ty!

Answer 31

What about that one^^

Answer 32

By the way to get the smilie face hold the alt key and then press 1

Answer 33

No, doesn't work

Answer 34

I agree with that

Answer 35

it doesnt work on my kb also

Answer 36

maybe, cuz I have windows8, dk how would that make a difference.

Answer 37

I have windows 7

Answer 38

i am on ubuntu linux

Answer 39

copy it from google <---------- best method

Answer 40

Yeah. but it is kind of small!

Answer 41

http://samuel-wilke.jimdo.com/cool-symbols-to-copy-and-paste/

Answer 42

I have windows 7 and it does work for me - then again it's Microsoft™ so maybe it has to do with an update to Windows 98

Answer 43

@╰☆╮Openstudier╰☆╮, that is a cool attachment!

Answer 44

windows98? LMFAO

Answer 45

yup!

Answer 46

windows 98 hahah

Answer 47

even win 9 is still LMF.....

Answer 48

unless you are living 5-6 yrs later, than yeah.

Answer 49

sorry

Answer 50

lol

Answer 51

I just brought up Win 98 because Microsoft is so messed up maybe the problem could have started way back then

Answer 52

Win 98? I've never heard of that

Answer 53

Yeah I think it goes back to the late 1990's - it was notorious for crashing and you woluld lose everything you had typed since your last save.
Good old Microsoft

Answer 54

When it crashed, you'd get the infamous blue screen
(I bet Microsoft invented that !!!)