The function that models the profit of the company in million of dollars is:

where x represents the number of years since the company started. We want to find when the profit of the company was $4 million. Setting P as 4 in above equation, we can find the value of x when the profit was $4 million.
Thus, we can conclude that the profit of the company was $4 million in 2nd and 4th year
I'm pretty sure that a rate is a ratio and a ratio is a rate because 2:3 can be saying a rate and it can be a ratio as well. I don't know how to explain it very well so sorry
The value is 20,000 because 2x10 equals 20, 20x1,000 equals 20,000
Answer:
-5 ÷ 4 = -1.25 or 1 
The answer is -1.25
I hope that this helps you! ^‿^