Answer:
I think it is the right clock wise?
The answer is one thousand five hundred thirty eight
50 degrees is one while the other two are 130 degrees
Okay, the exponential function is

The start price of it in t=0 is 3,500, as we can see on the graph. Then, the function becomes

Let's see at t=2, where the price is g=2000:

Take natural logarithm:



So, the difference between t=0 and t=2 is

And then we get the change of x in one year equal to 0.035.
So, the final equation is

You can insert any t and see that it is correct, for example t=7
3(-1.5) + 4 = -0.5
3(0.5) + 4 = 5.5