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Need a refresher.. Don't really remember how to solve this one.

Not a clue.

well it is the very next year and we are given the percentage decreases by 0.016 per year

I thought for this problem I have to do the f(x1)- f(x2) thing

you are actually given the rate which is -0.016

y=-0.016x+b
you just need to find b now

well did you understand at t=0 we have .51?

No because I don't get what "t" stands for..

t is the time

in years

after 2000

Oh..

or I used t for time variable so t=0

Okay

so you have two points
(0,.51)
(1,.494)

you could even do more points if you wanted to

Okay. So the answer is p(x)= -0.016x +.51

yes

Okay thanks.

I understand it now.

The answer was incorrect. The correct answer is -1.6x+51