Answer:

1. 79/28

2. 253/30

Step-by-step explanation:

1) 1/4+2 4/7 = 1/4+18/7

1/4+18/7 = 7/28+72/28 = 79/28

2) 1 1/2+3 5/6+2 1/3=

3/2+23/5+7/3=

45/30 +138/30 +70/30=

253/30