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expeople1 [14]
2 years ago
12

PLEASE HELPPPJust 16 and 18 ​

Mathematics
1 answer:
zysi [14]2 years ago
8 0

i speak Russian but can’t understand this very well, the instructions aren’t really clear, what’s the translation?

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3 years ago
Read 2 more answers
The​ half-life of a certain tranquilizer in the bloodstream is 22 hours. How long will it take for the drug to decay to 90​% of
nasty-shy [4]

Answer:

It will take approximately 3.34 hours for the drug to decay to 90% of the original dosage

Step-by-step explanation:

As suggested, we use the formula for exponential decay:

A(t)=A_0\,e^{-k\,t}

From the given information, the half life of the drug in blood id 22 hours, so that means that it takes that number of hours to go from the initial value A_0, to a final value equal to A_0/2. Using this information we can find the decay rate "k" by solving for this parameter in the formula, and using the natural log function to bring the exponent down:

A(t)=A_0\,e^{-k\,t}\\\frac{A_0}{2} =A_0\,e^{-k\,*22}\\\frac{A_0}{A_0*2} =e^{-k\,*22}\\\frac{1}{2} =e^{-k\,*22}\\ln(\frac{1}{2})=-k\,*22\\ k=-\frac{ln(\frac{1}{2})}{22} \\k=0.0315

Now we use this value for the decay rate "k" to calculate how long it would take to decay to 90% of the original dose;

A(t)=A_0\,e^{-0.0315\,t}\\0.9*A_0} =A_0\,e^{-0.0315\,t}\\\frac{0.9*A_0}{A_0} =e^{-0.0315\,t}\\0.9 =e^{-0.0315\,t}\\ln(0.9)=-0.0315\,t\\ t=-\frac{ln(0.9)}{0.0315} \\t=3.3447\,hours

7 0
3 years ago
What is the number of chocolate-covered pretzels per ounce
bonufazy [111]
If this is your question, the answer is 4
<span>There are 64 pretzels in a 16 ounce bag of chocolate covered pretzels. what is the number of chocolate covered pretzels per ounce</span>
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Felicia is 6 years older than Felipe and is five years younger than Fran. If Fran is 22 years old, how old is Felipe
Lady_Fox [76]

Answer:

17

Step-by-step explanation:

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3 years ago
The volume of a three-dimensional shape is
Karo-lina-s [1.5K]
Are you looking for the equation.. V=bh?
5 0
3 years ago
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