Answer:
Linear Function

Step-by-step explanation:
Let
x----> the time in hours
y----> the total inches of snow on the ground
we know that
The function that best model this situation is the linear function
so

In this problem

----> the y-intercept
substitute

D.
a.
b.
hope that helped
I believe its 80 if you derive it out, but there is no units of measurement.