1. 5/7 + 2/4 =

Find a common denominator for 7 and 4, which is 28.

Convert the fractions: (5*4)/(7*4) + (2*7)/(4*7) = 20/28 + 14/28.

Add the numerators: (20 + 14) / 28 = 34/28. Simplify to 17/14.