Answer:
Step-by-step explanation:
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2 answers:
Answer: ?=5
Step-by-step explanation:
In a rectangle the opposite sides are congruent (same length).
So we have ?+?+3+3=16
Let's use a variable for ?
x+x+3+3=16
Since there are 2 of the variable x we can write it as 2x since 2 of something means it's doubled. We can also combine 3 and 3.
2x+6=16
Let's subtract 6 from both sides.
Now let's divide both sides by 2 to find the value of x (which is ?)
The value of x/? is 5.
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Answer:
a)
b)
c) For this case we want to find when the quantity is below 25 mg, so we can do this:
We can divide both sided by 250 and we got:
Now we can apply natural log on both sides and we got:
And if we solve for t we got:
So the answer for this case would be 12.358 years after.
Step-by-step explanation:
Part a
For this case we know that the decay rate per year is about 17% or 0.17 in fraction and the initial amount is 250 mg for 2009, we can define the model like this:
Where A represent the amount of the substance in mg, r the decay rate = 0.17 and t the number of years after 2009.
Our model for this case would be:
Part b
For this case we have that t= 2023-2009=14 years, so then we can find the amount of substance like this:
Part c
For this case we want to find when the quantity is below 25 mg, so we can do this:
We can divide both sided by 250 and we got:
Now we can apply natural log on both sides and we got:
And if we solve for t we got:
So the answer for this case would be 12.358 years after.