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3 years ago

Need help on question 11 please!! (Will mark as Brainliest)

Mathematics

1 answer:

emmainna [20.7K]3 years ago

4 0

I think it is adjacent because it isn't linear or vertical at all.

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The population of a town is increasing by 300 inhabitants each year. If its population at the beginning of 1990 was 21,152, what

babunello [35]

Answer:

Step-by-step explanation:

You take the starting year of 1990 and subtract it from 1999 to get the year span of 9,

You then take the amount per year the population goes up by which is 300, so 300 multiplied by 9 is 2,700

You add 2,700 to 21,152 to get B-23,852

8 0

4 years ago

What is 39 divide by 2

marta [7]

19.5

Step-by-step explanation:

u just divide 39 by 2 and get 19.5

6 0

4 years ago

K+2 over 3= -7 <br> How do u solve this problem

harkovskaia [24]

K+2/3=-7
K+2=-7x3
K+2=-21
K=-19

3 0

3 years ago

Will 7/8x6/6 be less than or greater than 7/8?

Akimi4 [234]

The answer to 7/8 * 6/6 is equal to 7/8 because 6/6 is equal to 1 and any number multiply by 1 is the own number :)))
i hope this is helpful
have a nice day

8 0

3 years ago

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.

I hope it helps you!

8 0

3 years ago