(1) The train travels 4 miles per gallon.
(2) The slope of the graph is 
Explanation:
(1) The miles that train travels per gallon is given by

Dividing, we have,

Thus, the train travels 4 miles per gallon.
(2) To determine the slope, let us consider two points from the graph.
The coordinates are
and 
Thus, substituting the coordinates in the slope formula, we get,

Simplifying, we have,

Thus, the slope of the graph is 
Answer:
No
Step-by-step explanation:
6/2=3
14/42=1/3=0.33333333333333333333
Answer:
x is equal to -9 thus it becomes -18 in the whole setup
Answer:
84
Step-by-step explanation:
Lauren has read 4 books per month. So the answer would be 84.