Since you can't subtract fractions with different denominators, you have to change it to 35 because that is their common denominator. 4/5 would be changed to 28/35 and 3/7 would be changed to 15/35. (If u r still confused on how u get o that let me know and I can explain). Next u just subtract the fractions and the answer is 13/35 yards (H)
