Answer:
-1/2
Step-by-step explanation:
Isolate the variable by dividing each side by factors that don't contain the variable.
(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:
1520/4=380 per month
Step-by-step explanation:
Answer:
C. Sample: Every animal's name is dropped into a container, and 15 names are pulled out of it.
Step-by-step explanation:
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