Answer:
Linear: 0.45-1 , 5 , 2x-6
Quadratic: 19x2 , x2-3x+4
Exponential: 4,5x+1.8
Please do not hesitate to ask further questions.
So an exponential equation is gonna be used for this problem. The formula for such is

, in which the a variable is the initial value and the b variable is the growth/decay rate.
For this situation, 1200 is gonna be your a variable since you've started out with it. And as for your b variable, its gonna be 107.3%, or 1.073, since it's increasing.
Your equation should look like this:

and from here just plug in 10 into the x variable and solve.
Multiply (1.073)^10 (don't round answers until the end), and take that answer and multiply it with 1200, your answer should be $2427.61.
354 as a percentage is 354%
35.4 as a percentage is 35.4%
That would be 7 - 1 = 6 turning points
How did bill spend longer .. days ... ? what