Answer: 480 mL, 600 mL
Step-by-step explanation:
Given
The concentration of the first acid is 75%
The concentration of the second acid is 30%
The final mixture has a concentration of 50%
The final volume is 1080 mL
Suppose x and y be the volume of the first and second acid

Solving the above equations we get

So, the quantity of the first acid is 480 mL and 600 mL for the second mixture.
Answer:
the correct answer is C
Step-by-step explanation:
X^2-4x-5=0
according viet’s theorem
the roots are 5 and -1
The y-intercept is 60
the slope is 30
the equation of the line is y=30x+60
the ordered pair (4,120) represents and increase of 30 minutes per hour