Hey there!
3 1/2 - 2 5/7
= (3 * 2 + 1 / 2) - (2 * 7 + 5 / 7)
= (6 + 1 / 2) - (14 + 5 / 7)
= 7/2 - 19/7
= 7/2 - 19/7
= 7 * 7 / 2 * 7 - 19 * 2 / 2 * 7
= 49/14 - 38/14
= 49 - 38 / 14 - 0
= 11 / 14
Therefore, your answer is: 11/14
Good luck on your assignment & enjoy your day!
~Amphitrite1040:)