Question

the first and correct answer will be marked as brainliest answer please answer must me with explanation ​

Answer 1

Answer:

b

Step-by-step explanation:

Answer 2

a) -2/3+(5/4+7/12)=> -2/3+(15/12+7/12)=>-2/3+22/12=>-8/12+22/12=>14/12=7/6

(-2/3+5/4)+7/12=> (-8/12+15/12)+7/12=>7/12+7/12=14/12=7/6

b) (3/5+3/10)+7/15=>(6/10+3/10)+7/15=> 9/10+7/15=>27/30+14/30=41/30

3/5+(3/10+7/15)=>3/5+(3/10+7/15)=>3/5+(9/30+14/30)=> 3/5+23/30=>18/30+23/30=41/30

Hence proved