Answer:
The concentration is simply 36%
Step-by-step explanation:
In this question, we are concerned with calculating the concentration of a new mixture formed from mixing some liters of each of two vinegar variants of different concentrations.
We proceed as follows;
The concentration of the new solution will contain 12% of 13L vinegar A and 70% of 9L vinegar B
13L of vinegar A will contain 13 * 12% = 13 * 0.12 = 1.56
9L of 70% vinegar B will contain 9 * 70% = 9 * 0.7 = 6.3
Now, the new mixture has a total volume of 13 + 9 = 22L
The concentration of the new mixture will thus be;
(1.56 + 6.3)/22
= 0.357 and that’s approximately 0.36 or simply 36%
The correct answer for 12 is B
Answer:
2.4 miles per hours
Step-by-step explanation:
if she traveled 1/5 of a mile in order for you ro do this you must first teun it into a full mile so times it by the required amount to equal one which would be five.
1/5 of a mile x 5 = 1
you must do this also to the time
5 minutes x 5 = 25 minutes
it takes her 25 minutes to travel one mile so because miles per hour is a ration you must find the amount in hours and not minutes.
So you must divide the hour equivilent by 25 minutes.
so if 1 hour equals 60 minutes
60 divided by 25 = 2.4
that is how you find miles per hour
2(x + delta x) = 2x + 2 delta x
so on top you have 2x + 2 delta x - 2x
which is 2 delta x
the delta x cancels out and you are left with just 2
so the limit is 2
