Answer:
In 4 months
Step-by-step explanation:
If you keep subtracting 140nfrom 3440 u will get 2880 after you do that 4 times. If you keep adding 220 to 2000 you will get 2880 after you do it 4 times.
1/2(4-14y)=y+50
1/(8 - 28y) = y + 50
8y - 400 - 28y² +
Now you can solve
f=9 x 20