Faith mixes 14 liters of 12% acid solution with a 30% acid solution to make a 18% acid solution

Suppose Faith mixes the 14 L of 12% solution with L of the 30% solution. Then the new solution, with a concentration of 18% acid, has a total volume of L.

For each liter used of the 12% solution, 0.12 L of acid is contributed; for each liter of the 30% solution used, 0.3 L of acid is contributed. In the new solution, each liter contributes 0.18 L of acid. So the amount of acid in the mixture satisfies

Solve for :

So Faith must use 7 L of the 30% solution to end up with the concentration she wants.

answer: 590

step-by-step explanation:

the answer is d

the answer is in the first quadrant, which make the y-int positive.

since the dots are going down, therefore the correlation is negative

i hope it is right.