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Tatiana [17]
2 years ago
13

The half life of radium is 1690 years. if 80 grams are present now, how much will be present in 830 years

Mathematics
1 answer:
Pachacha [2.7K]2 years ago
5 0

Answer:

A(t) = amount remaining in t years

      = A0ekt, where A0 is the initial amount and k is a constant to                     be determined.  

Since A(1690) = (1/2)A0 and A0 = 80,

                we have 40 = 80e1690k

                1/2 = e1690k

                ln(1/2) = 1690k

                k = -0.0004

So, A(t) = 80e-0.0004t

Therefore, A(430) = 80e-0.0004(430)

                           = 80e-0.172

                           ≈ 67.4 g

Step-by-step explanation:

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Which of these number words represents the numeral 4,056? four thousand, five hundred six four thousand, five hundred fifty-six
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Solution:

we have been asked to find

Which of the given number words represents the numeral 4,056?

Its about the counting.

On unit place we have 6.

on Tenth place we have 5.

on hundredth place we have 0.

On Thousand place we have 4.

so in our number word representation there will be no "Hundreds".

So it will make

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I NEED HELP QUICKLY
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