Geoff needs to wire a report leaving 3/4 in margins on his paper. the width of the paper is 8 1/2 in. he put the zero mark on the ruler at one end of the page. where should he put marks as a guide to draw the 3/4 in lines ?

To solve this problem you must apply the proccedure shown below:
 1. Based on the problem above, you have that the width of the paper is:
 
 2. Geoff must leave  in margins on his paper. Therefore, he needs to put marks as a guide at:
 
 Therefore, as you can see above, the answer is: 

Google it that might work