Question

pleas answer this all quetions​

Answer 1

Answer:

2. 3a+4b+7c,−5a+3b−6c and 4a−2b−4c

3a+4b+7c,−5a+3b−6c and 4a−2b−4cThe sum of 3a+4b+7c,−5a+3b−6c and 4a−2b−4c is calculated as shown below

3a+4b+7c,−5a+3b−6c and 4a−2b−4cThe sum of 3a+4b+7c,−5a+3b−6c and 4a−2b−4c is calculated as shown below(3a+4b+7c)+(−5a+3b−6c)+(4a−2b−4c)

3a+4b+7c,−5a+3b−6c and 4a−2b−4cThe sum of 3a+4b+7c,−5a+3b−6c and 4a−2b−4c is calculated as shown below(3a+4b+7c)+(−5a+3b−6c)+(4a−2b−4c)=3a+4a−5a+4b+3b−2b+7c−6c−4c

3a+4b+7c,−5a+3b−6c and 4a−2b−4cThe sum of 3a+4b+7c,−5a+3b−6c and 4a−2b−4c is calculated as shown below(3a+4b+7c)+(−5a+3b−6c)+(4a−2b−4c)=3a+4a−5a+4b+3b−2b+7c−6c−4cWe get,

3a+4b+7c,−5a+3b−6c and 4a−2b−4cThe sum of 3a+4b+7c,−5a+3b−6c and 4a−2b−4c is calculated as shown below(3a+4b+7c)+(−5a+3b−6c)+(4a−2b−4c)=3a+4a−5a+4b+3b−2b+7c−6c−4cWe get,=2a+5b−3c

3a+4b+7c,−5a+3b−6c and 4a−2b−4cThe sum of 3a+4b+7c,−5a+3b−6c and 4a−2b−4c is calculated as shown below(3a+4b+7c)+(−5a+3b−6c)+(4a−2b−4c)=3a+4a−5a+4b+3b−2b+7c−6c−4cWe get,=2a+5b−3cHence, the sum of 3a+4b+7c,−5a+3b−6c and 4a−2b−4c is 3c

3.5a-2b

1.2x+3x+4x=180

9x=180

x=20

2x=40

3x=60

4x=80