Question

Checking Answers
Which kind of function best models the set of data points (–3, 18), (–2, 6), (–1, 2), (0, 11), and (1, 27)?
I got none of the above

Answer 1

linear
quadratic
exponential
none of the above

Answer 2

Find the difference between x and y for two pairs
-2-(-3) , 6-18
1, -12
Now you do the same thing for
(-2, 6) and (-1, 2)

Answer 3

So quadratic?

Answer 4

No we can't say anything right now. find the difference :)

Answer 5

-8,-3?

Answer 6

It's linear

Answer 7

thanks for giving me a boost :)

Answer 8

no, not linear

Answer 9

oh really

Answer 10

(-1-(-2), (2-6)
1, -4

Answer 11

for same change in x 1 , there are different changes in y
so it's not linear :)

Answer 12

yeah so its exponential?

Answer 13

if its not linear or exponential ... then quadratic

Answer 14

As x increase, y decreases but as x increases beyond 0 y increases. An exponential will either decrease or increase. So it's not exponential

Answer 15

Its quadratic

Answer 16

let's confirm that, it could be none also

Answer 17

okay...but Im pretty sure its quadratic..granted its just a kind of educated guess it seems to fit

Answer 18

(–3, 18), (–2, 6), (–1, 2), (0, 11), and (1, 27)
let's find the first differences
(1, -12) (1, -4) , (1, 9) (1, 16)

Now differences of these
(0, 8) (0, 13) (0, 7)
Difference in y is not same so it's not quadratic :)