Answer:
The answer is 4 liters.
Step-by-step explanation:
We want a final 25% solution, which means that the solvent should constitute 25 percent of all the liters of solution.
Let us call the litres of 40% solution, so when they are added to the 12 litres of 20% solution, the total litres of the new solution are:
of these liters, 25% must be the solvent:
Now for the 40% solution, the liters of the solvent are , and for the 20% liter solution, the liters of solve are liters. Thus the total liters of the solvent are
Therefore
Opposite side length = 9
Adjacent side length = 12
Hypotenuse side length = 15
sin∅ is found with (opposite/hypotenuse). Therefore, sin∅ = 9/15.
cos∅ is found with (adjacent/hypotenuse). Therefore, cos∅ = 12/15.
tan∅ is found with (opposite/adjacent). Therefore, tan∅ = 9/12.
The answer is D.
You could use a calculator, or do mental math.
Answer:
same
Step-by-step explanation: