The initial amount was 200 dollars.
If you sub in 0, you get the amount at 0 months.
Rate of change is the slope. You are losing -75 a month, which is the rate of change.
If you would like to know for how many days will 1/2 of a bag of dog food last, you can calculate this using the following steps:
1 day ... 3 bags of dog food
x days = ? ... 1/2 of a bag of dog food
1 * 1/2 = 3 * x
1/2 = 3 * x /3
x = 1/2 * 1/3
x = 1/6 of a day
The correct result would be 1/6 of a day.
4-3=1 and 5-4= 1 so it's 4