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3 years ago

Iĺl mark brainlist

Mathematics

1 answer:

N76 [4]3 years ago

7 0

Answer:

C. 16√5

Step-by-step explanation:

a squared plus b squared equals c squared!

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Daniel wants to order shirts on the internet, shirts cost $20.00 and shipping on all oders is $10.99. Daniel has $50 to spend

MatroZZZ [7]

He spent $30.99 and has $10.01 left

6 0

3 years ago

Read 2 more answers

the half life of c14 is 5730 years. Suppose that wood found at an archeological excavation site contains about 35% as much C14 a

Furkat [3]

Answer:

The wood was cut approximately 8679 years ago.

Step-by-step explanation:

At first we assume that examination occured in 2020. The decay of radioactive isotopes are represented by the following ordinary differential equation:

$\frac{dm}{dt} = -\frac{m}{\tau}$ (Eq. 1)

Where:

$\frac{dm}{dt}$ - First derivative of mass in time, measured in miligrams per year.

$\tau$ - Time constant, measured in years.

$m$ - Mass of the radioactive isotope, measured in miligrams.

Now we obtain the solution of this differential equation:

$\int {\frac{dm}{m} } = -\frac{1}{\tau}\int dt$

$\ln m = -\frac{1}{\tau} + C$

$m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }$ (Eq. 2)

Where:

$m_{o}$ - Initial mass of isotope, measured in miligrams.

$t$ - Time, measured in years.

And time is cleared within the equation:

$t = -\tau \cdot \ln \left[\frac{m(t)}{m_{o}} \right]$

Then, time constant can be found as a function of half-life:

$\tau = \frac{t_{1/2}}{\ln 2}$ (Eq. 3)

If we know that $t_{1/2} = 5730\,yr$ and $\frac{m(t)}{m_{o}} = 0.35$ , then:

$\tau = \frac{5730\,yr}{\ln 2}$

$\tau \approx 8266.643\,yr$

$t = -(8266.643\,yr)\cdot \ln 0.35$

$t \approx 8678.505\,yr$

The wood was cut approximately 8679 years ago.

5 0

3 years ago

Please help with this ! will give brainless

irakobra [83]

Answer:

x^13

2n^2x-5n^7

-6x^10-x

60s^7

6v^7

p^6

-4b^9/3

pls mark as brainliest if its right :)

7 0

3 years ago

There are only green yellow blue cubes in a bag

GREYUIT [131]

Answer:

1 ÷ 11

Step-by-step explanation:

The computation is shown below:

let us assume the yellow cubes be x

So, blue cubes be 2x

And, green cubes be 2x (4) 8x

Now the ratio is

Yellow: Blue: green

x:2x:8x

1:2:8

Now the probability of yellow cubes is

= 1 ÷ (1 + 2 + 8)

= 1 ÷ 11

5 0

3 years ago

Each side of a square plastic tarp is 9 meters long. what is the tarps perimeter

emmainna [20.7K]

Answer:

Step-by-step explanation:

9 times 4

8 0

3 years ago