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2 years ago

Plz help me out, i dont really understand this question, WILL GIVE BRAINLIEST TO THE MOST EDUCATED!!

Mathematics

2 answers:

jolli1 [7]2 years ago

6 0

Answer:

Step-by-step explanation:

Basically, just substitute t for the value you were given, in this case, 4.

3*4^2 - 4

Do exponents first:

3*16 - 4

Multiply next

48-4

Subtract

allochka39001 [22]2 years ago

4 0

Answer:

its 44 the answer

Step-by-step explanation:

I hope this helps

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R varies directly as t and inversely as w.

8_murik_8 [283]

Answer:

yeah

Step-by-step explanation:

4 0

3 years ago

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

The point (0,5) lies on a circle that is centered at the

sergey [27]

Answer:5,5,yes

Step-by-step explanation:

5 0

3 years ago

$20 iteam marked down 40%

Lana71 [14]

Answer:

$12

Step-by-step explanation:

Multiplier=0.6

20 times 0.6 = 12

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2 years ago

What is the measure of angle BAC? Round to the nearest

tigry1 [53]

Answer:

the answer is c. 44, i hope it works

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers