7 L of one solution is mixed with 3 L of another, making a new solution with a total volume of 10 L and concentration 29%. This means the new solution contains
(10 L) * 29% = (10 L) * 0.29 = 2.9 L
of acid.
Let the concentration of the first solution be <em>c</em>%. Each liter of the 15% acid solution contributes 0.15 L, and each liter of the solution of unknown concentration contributes 0.01<em>c</em> L of acid. To end up with a total of 2.9 L of acid, we would get
7 * (0.01<em>c</em> L) + 3 * (0.15 L) = 2.9 L
Solve for <em>c</em> (we can omit the units):
0.07<em>c</em> + 0.45 = 2.9
0.07<em>c</em> = 2.45
<em>c</em> = 35
So the first solution has a concentration of 35%.
Thank you for posting your question here at brainly. The answer to the above question is the first one in the choices which is 15. Below is the solution:
<span>
3x + 10 = 55
Subtract 10 from each side...
3x = 45
Divide by 3...
x = 15</span>
Get photo math it may work.
Answer:
Table J
Step-by-step explanation:
A direct variation is a simple relationship between x and y.
When you are looking for the direct relationship you should use the formula for it y=kx, or you could just divide y over x (
).
<em><u>Analysing Table F:</u></em>
The relationship between x and y is 4.
The origin is fine and doesn't ruin the relationship.
<em><u>Analysing Table G:</u></em>
The relationship between x and y is 5.
<em><u>Analysing Table H:</u></em>
The relationship between x and y is 
.
Like I said before the origin doesn't ruin the relationship so it's fine.
<em><u>Analysing Table J:</u></em>
This one doesn't have a direct relationship between x and y.
Wooo nada I just want ya to be a good friend to
