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SOVA2 [1]
4 years ago
9

How do I do this I'm am really confused?

Mathematics
1 answer:
Ahat [919]4 years ago
5 0
Set 2y equal to (4y-42).
2y=4y-42
Then subtract 4y
-2y=-42
Divide by -2
y=21
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A radioactive substance decays at a continuous rate of 12% per year, and 90 mg of the substance is present in the year 2000. (a)
Alla [95]

Answer:

A(t) = 90e^0.12t ;

299 mg

Step-by-step explanation:

General Continous growth rate equation :

A = Pe^rt

A = amount present, t years after year of initial amount.

Here,

P = 90 mg, amount in year 2000

r = rate = 12% = 0.12

t = years after 2000

Therefore,

A is written as ;

A(t) = 90e^0.12t

Amount present in year 2010 ;

t = 2010 - 2000 = 10

A(10) = 90e^0.12(10)

A(10) = 90 * e^1.2

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3 years ago
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ch4aika [34]

9514 1404 393

Answer:

  50 ft

Step-by-step explanation:

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7 0
3 years ago
Please help me ASAP please
lianna [129]

Answer:

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Step-by-step explanation:

6 0
3 years ago
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mr_godi [17]

Answer:

4 gallons

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Answer:

3

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4 0
2 years ago
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