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andrezito [222]
2 years ago
9

An electronics retailer offers an optional protection plan for a mobile phone it sells. Customers can choose

Mathematics
2 answers:
Darina [25.2K]2 years ago
8 0

Answer:

$79

Step-by-step explanation:

That's the Khan Academy answer

Oxana [17]2 years ago
4 0

Answer:

79$ / 0.14

Step-by-step explanation:

Depending on the khan academy question the answer may differ between the two. Make sure to read your example closely. If it asks for dollars 79 is your answer if not go for 0.14. <3

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iVinArrow [24]

Answer:

for 12 people cut everything in half

for 36 add the 12 to 24 people

6 0
2 years ago
Radium 226 has a decay rate that satisfies the differential equation D'(t)= -.00043D(t). Assume that D(0)=100.
Rus_ich [418]

Answer:

A) D(t)=100e^{-0.00043t}

B){D(t=100)}=95.8

C) τ=2326 years

Step-by-step explanation:

A)

Consider the differential equation:

\frac{dD}{dt}=-0.00043D

Separate variables dD and dt:

\frac{dD}{D}=-0.00043dt

Integrate: Remember that The integral of dD/D is ln(D).

\int\limits^{D}_{D_0} {\frac{1}{D} } \, dD=\int\limits^{t}_{0} {-0.00043} \, dt

ln(\frac{D}{D_0})=-0.00043t\\\frac{D}{D_0}=e^{-0.00043t}

D=D_0*e^{-0.00043t}

And do D_0=100, so:

D=100*e^{-0.00043t}

B)

The function we have found is a function that let us know how many of Ra is after t years, so, evaluate the function at t=100:

D(t=100)=100*e^{-0.00043*100}=95.791\\

Which rounded is 95.8.

C) For this equation it is known that the life half life τ is equal to (1/λ), where λ is the exponential number that is multiplying to -t in the D(t) function; so for this case, λ=0.00043, and the life half life is \frac{1}{0.00043}=2325.58,

which rounded is equal to 2326 years.

3 0
2 years ago
11x -24 = -2 algebra equation<br>​
Soloha48 [4]

Answer:

11x-24 = -2

11x= -2+24

11x = 22

therefore x = 2

7 0
2 years ago
Read 2 more answers
-8 + 70/-7 = ? <br> Evaluate?
GREYUIT [131]

Answer:

-18

Step-by-step explanation:

-8 + 70/-7

-8 - 10

-18

6 0
2 years ago
Find the radian measure of an angle of 280
Lana71 [14]

Formula for degree to radian:

degree ×\frac{\pi }{180}

so...

280* \frac{\pi }{180}

Exact answer:

\frac{14\pi }{9}

Rounded answer:

4.89

Hope this helped!

8 0
2 years ago
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