3 years ago

Please help! you will get 'Brainliest' if you do.

Mathematics

1 answer:

andre [41]3 years ago

3 0

Answer:

D is correct, based on my understanding

Step-by-step explanation:

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Evaluate when e = 3 1/2.b=6.7 t=8.0 <br><br>e-b + t

iVinArrow [24]

3.5 (E) - 6.7 (B)+ 8 (t)= 18.2

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3 years ago

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pashok25 [27]

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2 years ago

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A scientist begins with 250 grams of a radioactive substance. After 250 minutes, the sample has decayed to 32 grams. Rounding to

s2008m [1.1K]

Answer:

Part 1 : $A=250 e^{-0.008223t}$

Part 2 : Half life is 84 minutes ( approx )

Step-by-step explanation:

Part 1 : Suppose the function that shows the amount( in grams ) of the substance after t minutes,

$A=A_0 e^{kt}$

If t = 0 min, A = 250 grams,

$250=A_0 e^{0}$

$\implies A_0 = 250$

If t = 250, A = 32 grams,

$32 = A_0 e^{250k}$

$32 = 250 e^{250k}$

$0.128 = e^{250k}$

Taking ln both sides,

$\ln(0.128) = 250k$

$\implies k =\frac{\ln(0.128)}{250}=-0.008223$

Hence, the equation that shows this situation,

$A=250 e^{-0.008223t}$

Part 2 : If A = 250/2 = 125,

$125 = 250 e^{-0.008223t}$

$0.5 = e^{-0.008223t}$

Taking ln both sides,

$\ln(0.5) = -0.008223t$

$\implies t =\frac{\ln(0.5)}{-0.008223}\approx 84$

Therefore, the half life of the substance would be 84 minutes.

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3 years ago

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aivan3 [116]

Answer:

Step-by-step explanation:

C: Side-Angle-Side

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3 years ago

Answer ASAP please, i got stuck with this question and I need to know how to answer it

Phoenix [80]

Step-by-step explanation:

1. Do 1022÷2 to get the base number (511)

2. Multiply based number by 3 to get 'no' votes (1533)

3. add 'yes' votes to the 'no' votes(2555)

Hope this Helped!

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