Question 1176397
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This question 

<pre>
    The rate of change is __ miles per gallon" 
</pre>

is not consistent with the other request

<pre>
    Compute the​ slope, or rate of change in the amount of gasoline.
</pre>


These are two DIFFERENT questions about two different conceptions,

so it is very important for you to understand clearly the difference between the two.