Answer:
The initial value is $78
Step-by-step explanation:
Given

(weekly)
Required
Determine the initial value
The initial value is the amount he has in its bank account before making his weekly savings.
From the question, we have that his initial balance is $78.
Hence, the initial value is $78
However, his weekly balance can be expressed as:

Represent number of weeks with x; So, we have:


Answer:
25
Step-by-step explanation:
Answer:
x<15
Step-by-step explanation:
x needs to be less than 15 since Courtney's not paying any more than that.
Answer:
You need to find k, the constant of proportionality, by dividing y with its corresponding x.