after crossing a bridge, abdul drives at a constant speed. the graph below shows the distance (in miles) versus the time since he crossed the bridge (in hours)


We will solve as follows:
a)
We can see that after each hour the distance will increase by 75 miles.
b)
We calculate the slope as follows:
We can see that the graph passes by the points (0, 0) & (1, 75), now we replace in the following expression:
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]Now, we replace:
[tex]m=\frac{75-0}{1-0}\Rightarrow m=75[/tex]So, the slope is 75.