Answer:
8n-4
Step-by-step explanation:
2n-n-4+7n
=2n-n+7n-4
=8n-4
Answer:yes
Answer: C.V=C1.V1 +C2.V2
Step-by-step explanation: C=(C1V1 + C2V2)/V -> C=(20%.V+25%V)/2V-> C=22,5%
Answer: 441
441