For which value of k does Limit as x approaches kf(x) = 4? 0 2 6 8
2 answers:
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Answer:
Step-by-step explanation:
Let x is the total population of the world.
Therefore, by the condition given the population of North America is
Again it is given that fraction of the world's population lives in the United States of America.
So, is the population of USA.
Therefore, the fraction of the population of North America that is the population of USA will be (Answer)
Answer:
2/7 ml
Step-by-step explanation:
When we have a solution expressed in Q mg/ml, the concentration is (Q/10)%.
For example, a solution of 3 mg/ml is a 3/10=0.3% concentration solution, a solution of 40 mg/ml is a 40/10=4% concentration solution.
<em>Why? </em>
Q mg/ml means that 1 ml of solution has Q mg of the drug or active component. So, 100 ml have 100*Q mg.
But 100*Q mg = Q/10 grams.
If a solution has Q/10 grams in 100 ml, then it is a (Q/10)% concentration.
Now, we have 5 ml of a solution that contains tobramycin, 3 mg/ml (each ml has 3 mg of tobramycin).
This means that the 5 ml contain 15 mg of tobramycin.
On the other hand, we have another solution S containing 40 mg/ml of tobramycin. This means that each ml of S contains 40 mg of tobramycin.
Let x be the amount of ml of S we have to add to our first 5 ml.
If 1 ml of S contains 40 mg of tobramycin, x ml contain 40*x mg.
If we add this x ml to our first 5 ml, we have 5+x ml containing 15+40*x mg of tobramycin.
Now, cross-multiply to get how much tobramycin contains 1 ml of this new solution.
5+x ml ____contain____15+40*x mg of tobramycin
1 ml ____contains____? mg
And we have
as a result, we have a solution of
We want to prepare a solution 0.5% in concentration.
Using what we state at the beginning, we need to find a value x such that
solving for x
So, we have to add just 2/7 ml of the stronger solution.