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arsen [322]
2 years ago
6

Use the expression 4z + 8 + 3x + b to answer the following

Mathematics
1 answer:
nikdorinn [45]2 years ago
7 0

Answer:

part a:

4z, 8, 3x, and b

part b:

8

part c:

4 and 3

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For number 2. The pilot flew 4 circuits and in total by the 5th day he flew 14 right?
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Alexander Litvinenko was poisoned with 10 micrograms of the radioactive substance Polonium-210. Since radioactive decay follows
koban [17]

Answer:

The amount of Polonium-210 left in his body after 72 days is 6.937 μg.

Step-by-step explanation:

The decay rate of Polonium-210 is the following:

N(t) = N_{0}e^{-\lambda t}     (1)

Where:

N(t) is the quantity of Po-210 at time t =?

N₀ is the initial quantity of Po-210 = 10 μg

λ is the decay constant  

t is the time = 72 d  

The decay rate is 0.502%, hence the quantity that still remains in Alexander is 99.498%.    

First, we need to find the decay constant:

\lambda = \frac{ln(2)}{t_{1/2}}    (2)

Where t(1/2) is the half-life of Po-210 = 138.376 days

By entering equation (2) into (1) we have:

N(t) = N_{0}e^{-\frac{ln(2)}{t_{1/2}}*t}} = 10* \frac{99.498}{100}*e^{-\frac{ln(2)}{138.376}*72} = 6.937 \mu g    

Therefore, the amount of Polonium-210 left in his body after 72 days is 6.937 μg.  

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8 0
2 years ago
You reach into your sock drawer without looking. You have 9 white pairs and 11 other colored pairs. What is the probability you
Allisa [31]

Answer:9/20

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6 0
3 years ago
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Answer:

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Since, given 68% data.

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mean + standard deviation = 14 + 4 = 18

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