Question

at what rate was the snow falling during the first snowfall?
answer
2 inches every 1 hour
1 inch every 3 hours
3 inches every 1 hour
1 inch every 2 hours

Explanation:

Step1: Identify two points on first - part of graph

Let's take the points (0, 5) and (3, 11).

Step2: Calculate the rate of change

The rate of change (slope) formula is $m=\frac{y_2 - y_1}{x_2 - x_1}$. Here, $x_1 = 0,y_1 = 5,x_2=3,y_2 = 11$. So $m=\frac{11 - 5}{3-0}=\frac{6}{3}=2$.

Answer:

2 inches every 1 hour