Answer:
value of a in terms of b and c is: 
Option D is correct.
Step-by-step explanation:
We are given:

We need to find a in terms of b and c
We have: 
Put value of d 

So, value of a in terms of b and c is: 
Option D is correct.
Answer:
10
Step-by-step explanation:
Answer:
yes though i am not completely sure
Step-by-step explanation:
Answer:
the second one
Step-by-step explanation:
420 minus 20 for every week "W" until the balance is at 240 dollars
53 + 9x < 115
THE LESS THAN SYMBOL SHOULD HAVE A LINE UNDER IT!