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Effectus [21]
2 years ago
11

After releasing of radioactive material into.The atnosphere from.A nuclear.Powe plant in a country in 1988, the hay in that coun

try was contaminayed by radioactive.Isotope remains, how long did the famers need to.Wait to use this hay
Mathematics
1 answer:
Radda [10]2 years ago
4 0

Answer:

the question is incomplete, so I looked for a similar one:

<em>After the release of radioactive material into the atmosphere  from a nuclear power plant, the hay was contaminated by iodine  131 ( half-life, 8 days). If it is all right to feed the hay to cows  when 10% of the iodine 131 remains, how long did the farmers  need to wait to use this hay? </em>

iodine's half life (we are given x, we need to find b):

0.5A₀ = A₀eᵇˣ

x = 8 days

we eliminate A₀ from both sides

0.5 = eᵇ⁸

ln 0.5 = ln eᵇ⁸

-0.69315 = b8

b = -0.69315 / 8 = -0.08664

since the farmers need to wait until only 10% of the iodine remains (we already calculated b, now we need to find x):

0.1A₀ = A₀eᵇˣ

0.1 = eᵇˣ

ln 0.1 = bx

where b = -0.08664

x = ln 0.1 / -0.08664  = -2.302585 / -0.08664  = 26.58 days

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Galina-37 [17]

Answer:

I solved part a

To solve this question, we need to solve an exponential equation, which we do applying the natural logarithm to both sides of the equation, getting that it will take 7.6 years for for 21 of the trees to become infected.

PART C

The logarithmic model is: g(x)= in x/0.4

We are given an exponential function, for the amount of infected trees f(x) after x years.To find the amount years needed for the number of infected trees to reach x, we find the inverse function, applying the natural logarithm.

Step-by-step explanation:

mark me brainliest!!

4 0
2 years ago
HELP ME ASAP! Will give BRAINLIEST!
Nataliya [291]

Answer:

Linear

Step-by-step explanation:

It is just a never ending straight line. no complications in that.

6 0
3 years ago
Read 2 more answers
Okay I know I suck at math and I really don't understand math that well so can you help me on this??? Thank you!
Alja [10]
W - width
l - length
p - perimeter

The perimeter is 72 cm (p=72).
The length is twice the width (l=2w).
The formula for perimeter is 2w+2l=P.

p=72 \\&#10;l=2w \\ \\&#10;2w+2l=p \\&#10;2w+2 \cdot 2w=72 \\&#10;2w+4w=72 \\&#10;6w=72 \\&#10;w=12 \\ \\&#10;l=2w=2 \cdot 12 =24

Check the answer:
2 \cdot 12 + 2 \cdot 24 \stackrel{?}{=} 72 \\&#10;24+48 \stackrel{?}{=} 72 \\&#10;72 \stackrel{?}{=} 72 \\ \hbox{true}

The length of the photo is 24 cm, the width of the photo is 12 cm.
8 0
3 years ago
Can an object be in pure translation as well as in pure rotation simultaneously?
Inessa [10]
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"Pure rotational" motion means the object is rotating, but its position in space isn't changing. Mathematically, that means that every point on the object moves in a circle around some axis (usually through the object's center of mass).

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
</span>
5 0
3 years ago
The two trapezoids in the graph below are similar. Which sequence of transformations proves that the trapezoids are similar?
Hoochie [10]
The answer is B.


Hopes this helps!! :')
3 0
2 years ago
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