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3 years ago

13

Is 5 a factor of 24r + 45? yes no HELP PLSSS

2 answers:

Sphinxa [80]3 years ago

6 0

Answer:

sure

Step-by-step explanation:

____ [38]3 years ago

4 0

Answer:no

Step-by-step explanation:

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Marco and his two younger sisters would like to purchase a silver charm bracelet for their mother’s birthday. they went to the m

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Function would be f(x) = 5x+85

here, x= 15

5(15)+85 = 75+85 = $160

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3 years ago

I’ve looked at this for a while, can someone clear up the answers for me? I can’t figure it out.

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3 years ago

Two different radioactive isotopes decay to 10% of their respective original amounts. Isotope A does this in 33 days, while isot

Andrews [41]

Answer:

The approximate difference in the half-lives of the isotopes is 66 days.

Step-by-step explanation:

The decay of an isotope is represented by the following differential equation:

$\frac{dm}{dt} = -\frac{t}{\tau}$

Where:

$m$ - Current mass of the isotope, measured in kilograms.

$t$ - Time, measured in days.

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

The solution of the differential equation is:

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

Where $m_{o}$ is the initial mass of the isotope, measure in kilograms.

Now, the time constant is cleared:

$\ln \frac{m(t)}{m_{o}} = -\frac{t}{\tau}$

$\tau = -\frac{t}{\ln \frac{m(t)}{m_{o}} }$

The half-life of a isotope ( $t_{1/2}$ ) as a function of time constant is:

$t_{1/2} = \tau \cdot \ln2$

$t_{1/2} = -\left(\frac{t}{\ln\frac{m(t)}{m_{o}} }\right) \cdot \ln 2$

The half-life difference between isotope B and isotope A is:

$\Delta t_{1/2} = \left| -\left(\frac{t_{A}}{\ln \frac{m_{A}(t)}{m_{o,A}} } \right)\cdot \ln 2+\left(\frac{t_{B}}{\ln \frac{m_{B}(t)}{m_{o,B}} } \right)\cdot \ln 2\right|$

If $\frac{m_{A}(t)}{m_{o,A}} = \frac{m_{B}(t)}{m_{o,B}} = 0.9$ , $t_{A} = 33\,days$ and $t_{B} = 43\,days$ , the difference in the half-lives of the isotopes is:

$\Delta t_{1/2} = \left|-\left(\frac{33\,days}{\ln 0.90} \right)\cdot \ln 2 + \left(\frac{43\,days}{\ln 0.90} \right)\cdot \ln 2\right|$

$\Delta t_{1/2} \approx 65.788\,days$

The approximate difference in the half-lives of the isotopes is 66 days.

4 0

3 years ago

Read 2 more answers

In the figure, parallel lines r and s are cut by line t

Lady_Fox [76]

Answer:

<u>x = 49</u>

Step-by-step explanation:

Since the line is parallel, the value of 2x - 8 is equal to 90.

=> 2x - 8 = 90

=> 2x = 98

=> <u>x = 49</u>

7 0

3 years ago

Read 2 more answers

Use the relationship between the angles in the figure to answer the question.

Galina-37 [17]

Answer:

The answer is the option $x+49\°+28\°=180\°$

Step-by-step explanation:

see the attached figure with letters to better understand the problem

we know that

$m$

$m$ -----> by vertical angles

$m$ -----> given problem

$m$ -----> given problem

substitute

$28\°+x+49\°=180\°$

5 0

3 years ago

Read 2 more answers