Answer:
Rate of change = 50$ per room
Initial value = 50$
Explanation:
We are given the following information in the question:
Number of rooms: 1 2 3 4
Cost($): 125 175 225 275
Formula:
Rate of change =

Putting the values, we get:
Rate of change =

Hence, the rate of change is 50$ per room.
Initial value is the value when x = 0

Thus, it could be interpreted as initial value is 504 which is basically flat fee no matter how many rooms are cleaned.