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Lera25 [3.4K]
3 years ago
8

When I double my number and add eight , I get my number plus twelve. What is my number?

Mathematics
1 answer:
Butoxors [25]3 years ago
8 0
Your answer is 2 as if you double 2 you get 4 and add 8 oh get 12
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Use the factor tree to find the prime factorization of 100.
Stolb23 [73]

Answer:

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I Need help please I don’t understand this
Otrada [13]

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9. Determine how long it takes for 80% of the material to decay.
Vilka [71]

Using an exponential function, it is found that it takes 18.6 days for 80% of the material to decay.

The amount of a substance after t days is modeled by:

A(t) = A(0)e^{-kt}

In which:

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The half-life is of 8 days, hence A(8) = 0.5A(0), and this is used to find k.

A(t) = A(0)e^{-kt}

0.5A(0) = A(0)e^{-8k}

e^{-8k} = 0.5

\ln{e^{-8k}} = \ln{0.5}

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k = 0.08664339757

Hence:

A(t) = A(0)e^{-0.08664339757t}

The time it takes for 80% of the material to decay it t for which A(t) = 0.2A(0), hence:

0.2A(0) = A(0)e^{-0.08664339757t}

e^{-0.08664339757t} = 0.2

\ln{e^{-0.08664339757t}} = \ln{0.2}

-0.08664339757t = \ln{0.2}

t = -\frac{\ln{0.2}}{0.08664339757}

t = 18.6

It takes 18.6 days for 80% of the material to decay.

To learn more about exponential functions, you can take a look at brainly.com/question/24906920

5 0
3 years ago
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M = 2x² - (ax/3) + by

Equation 2

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Hope this Helps!!!

7 0
3 years ago
In a theater there are 15 chairs in the first row, each row has 3 more chairs than the previous
andrew11 [14]

Answer:663

Step-by-step explanation:

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