Answer:
1010
Step-by-step explanation:
There are a whole class of questions that rely on the method to this one.
First add up what you know
1270 + 1150 + 870 + 1450 = 4740
Now add on the 5th month (which you don't know. Call it x)
4740 + x
Divide by 5
(4740 + x)/5 = 1150 and that is your equation
Solution
Multiply both sides by 5
5*(4740 + x) / 5 = 1150 * 5
4740 + x = 5750
Subtract 4740 from both sides
4740 - 4740 + x = 5750 - 4740
x = 1010
Which seems kind of low, but that's what the numbers come to.
Answer:320
Step-by-step explanation:
2/5 of the students surveyed lisen to country. So to make the percentage fit the total student population, you figure out what your 2/5 is in a percetnage. That comes out to 40%. so, 40% of 800 is 320.
The anset to your question is 1/2
after 6.2 hours the dose will decay to 70% in your bloodstream.
<h3>How long you must wait for the dosage to decay to 70% in your bloodstream?</h3>
We know that the half-life is 12 hours. Then the exponential relation for an initial dosage of A is:
If the dosage needs to decay to a 70% of the initial dosage, then we must have:
Now we need to solve that for t:
If we apply the natural logarithm in both sides, we get:
So after 6.2 hours the dose will decay to 70% in your bloodstream.
If you want to learn more about half-life:
brainly.com/question/11152793
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