Solve: 12/35 - 5/21 a. 11/105 b. 3/7 c. 61/105

a: 11/105

Step-by-step explanation:

Simplify the following:

12/35 - 5/21

Put 12/35 - 5/21 over the common denominator 105. 12/35 - 5/21 = (3*12) / 105 + (5 (-5)) / 105:

(3*12) / 105 + (5 (-5)) / 105

3*12 = 36:

36/105 + (5 (-5)) / 105

5 (-5) = - 25:

36/105 + (-25) / 105

36/105 - 25/105 = (36 - 25) / 105:

(36 - 25) / 105

| 3 | 6

- | 2 | 5

| 1 | 1:

Answer: 11/105