The answer is d i hope this helps even though you prob wont look
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You would start at (0,36) and then move to (1, 24) , (2,12), (3,0) because he gives out 12 bags per hour
Value of the expression will be 7
<u><em>Explanation</em></u>
Given value of the variables are :
and 
Given expression: 
So, <u>plugging the values</u> of
and
into the above expression, we will get...

So, the value of the expression will be 7.