Answer:
1 liter of water
Step-by-step explanation:
If 80 % is acid that's means 4 liters of the 5 is acid. (0.8 * 5)
The remaining amount is 1
x = 2
1. f(x) basically means y. So f(x) = 3 translates to y=3.
2. At y=3, you can see it meets at x=2.