SOLUTION: media services charges $30 for a phone and $20/month for its economy plan.the equation c=20t+30 describes the total cost,c, of operating a meia service phone for t months. The tot

Algebra ->  Linear-equations -> SOLUTION: media services charges $30 for a phone and $20/month for its economy plan.the equation c=20t+30 describes the total cost,c, of operating a meia service phone for t months. The tot      Log On


   

Question 186444: media services charges $30 for a phone and $20/month for its economy plan.the equation c=20t+30 describes the total cost,c, of operating a meia service phone for t months.
The total cost of service for 10 months is ?
If a customer has only $80 available how many months of service can she recieve?
A.3
B.2 1/3
C.2
D. 2 1/2''.
Answer by jojo14344(1513) About Me  (Show Source):
You can put this solution on YOUR website!

C=20t%2B30
Substitute when t=10months:
C=20%2A10%2B30=200%2B30=$230.00 for 10 months (ANSWER)
If customer only has $80.00:
80-phone=80-30=$50.00 remaining
Therefore, 50%2F%2820%2Fmonth%29===>cross%2850%292.5%2F%28cross%2820%29%2Fmonth%29=highlight%282.5months%29. Answer (D)
Thank you,
Jojo