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nlexa [21]
3 years ago
15

Radioactive material disintegrates at a rate proportional to the amount currently present. If Q(t) is the amount present at time

t (in weeks), then dQ dt = −rQ, where r > 0 is the decay rate.
A) If 500 mg of a mystery substance decays to 83.01 mg in 5 weeks, determine the decay rate r.
B) Find an expression for the amount of this substance present at any time t.
C) Find the time required for the substance to decay to one-half its original amount.

Mathematics
1 answer:
stepladder [879]3 years ago
3 0

Answer:

Step-by-step explanation:

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On average the number of electric guitars sold in New York each year is 88,438, which is seven times the average number of elect
Taya2010 [7]

Answer:

South Dakota sells 12634 electric guitars p/yr.

Step-by-step explanation:

All you have to do is divide 88,438 by 7 because New York sells 7 times more. Divide that by 7 and you get 12,634

In Conclusion, your answer is that South Dakota sells 12634 electric guitars p/yr (per year) on average.

8 0
3 years ago
How do you solve this (−18) ÷ 3 + (5)(−2) ?
Alekssandra [29.7K]
<span>(−18) ÷ 3 + (5)(−2)
Multiply 5 by -2
(-18)/3 -10
Divide -18 by 3
-5-10
Subtract 10 from -5
Final Answer: -15</span>
6 0
3 years ago
(7x+5)(2x3-4x2+9x-3)
Zanzabum

I believe the answer is 3x(3x + 2)




Step-by-step explanation:


4 0
3 years ago
I just need help with this
Alexxx [7]

Answer:

z = 4.5

Step-by-step explanation:

∠B = ∠B      ∠BAD = 90° - ∠B = ∠C

ΔBAD ~ ΔBCA

AB / z = BD / AB

z = AB * AB / BD = 3*3 / 2 = 4.5

3 0
2 years ago
Which expression best represents the product of quantities a, b, and H?
Aleks [24]

Answer:

C) abH

Step-by-step explanation:

a × b × H

= abH

The answer is option C

5 0
3 years ago
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