Asheet of paper is 812 inches by 11 inches. if a straight line is drawn from the top left corner to the bottom right corner, how long is the line? (round to the nearest tenth of an inch.) 193.3 in. 19.5 in. 7.0 in. 13.9 in.

See the picture attached to better understand the problem

we have 
8 1/2 in x 11 in
8 1/2 in-----> 8.5 in

Applying the Pythagoras Theorem
D²=11²+8.5²-----D²=193.25------> D=√193.25 in-----> D=13.90 in
Round to the nearest tenth of an inch
D=13.9 in

the answer is
13.9 in