12x + 24y < = 240
** because 2 hrs and 120 minutes = 240 minutes
Suppose you add x liters of pure water to the 10 L of 25% acid solution. The new solution's volume is x + 10 L. Each L of pure water contributes no acid, while the starting solution contains 2.5 L of acid. So in the new solution, you end up with a concentration of (2.5 L)/(x + 10 L), and you want this concentration to be 10%. So we have

and so you would need to add 15 L of pure water to get the desired concentration of acid.
Answer:
8.08
Step-by-step explanation:
Hello,
Let's calculate the radius:
r²=5²+7²=74
The circle's equation is (x+5)²+(y+7)²=74
Answer C
Hello,
Here is your answer:
The proper answer to this question is "37.5".
Your answer is 37.5!
If you need anymore help feel free to ask me!
Hope this helps!