<em>step</em><em> </em><em>by</em><em> </em><em>step</em><em> </em><em>expla</em><em>nation</em><em>:</em><em> </em>first you need to apply the rules of BODMAS and divide the 3 by the 1 then you are left with 9-3 which is 6 then evaluate what 3+1 is which is 4, now to get your final answer you divide the 6 by the 4 = 6/4 = 1.5.