Question

http://gyazo.com/b103599b30db3269c1b128ad813223ed

Anyone can help me with this? Medal given

Answer 1

HI!!

Answer 2

unfortunately you do not have a question there, just some data
but i can guess what it is
maybe write the model for the population decrease?

Answer 3

I need to write a explicit equation for it @misty1212

Answer 4

looks like it decreases by \(20\%\) a year every year
you can see that to get from one number to the next, you are multiplying by \(.8\)

Answer 5

if that is not obvious, than you can see that
\[\frac{8000}{10000}=\frac{6400}{8000}=...=.8\]

Answer 6

since you are starting at \(a_0=10000\) you can write this as
\[a_n=10000\times (0.8)^n\]

Answer 7

Oh! Perfect.

Answer 8

For this one: http://gyazo.com/a450b47cf79de9461f49805e022eecb4 is it An = 2an-1(4)?

Answer 9

@misty1212

Answer 10

there are lots of ways to write it

Answer 11

\[a_n=2\times 4^n\] is one way

Answer 12

http://gyazo.com/019b2242d8274e4cee957a89148e8472 The options @satellite73

Answer 13

if you are writing it as a recursion, maybe \[a_-n=4\times a_{n-1}\]

Answer 14

yeah C