Answer:
a) 2/12 + 1/4
2/12 + 1*3 / 4*3
2 + 3 /12
5/12
b) 2/3 + 13/15 + 11/12
2 * 20 / 3 * 20 + 13 * 4 / 15 * 4 + 11 * 5 / 12 * 5
40 + 52 + 55 / 60
147/60
49/20
c) 9/10 + 7/8 + 3/4
9*4 / 10*4 + 7*5 / 8*5 + 3*10 / 4*10
36 + 35 + 30 /40
101/40
It's finished!
Now, make sure to hit the Brainliest button if I am correct!