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3 years ago

Twenty billion is how much than nine billion ,write the answer in scientific notation

Mathematics

1 answer:

gayaneshka [121]3 years ago

5 0

11 times 10^9 maybe ?

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Dubnium-262 has a half-life of 34 s. How long will it take for 500.0 grams to

dmitriy555 [2]

Answer:

the time taken for the radioactive element to decay to 1 g is 304.8 s.

Step-by-step explanation:

Given;

half-life of the given Dubnium = 34 s

initial mass of the given Dubnium, m₀ = 500 grams

final mass of the element, mf = 1 g

The time taken for the radioactive element to decay to its final mass is calculated as follows;

$1 = 500 (0.5)^{\frac{t}{34}} \\\\\frac{1}{500} = (0.5)^{\frac{t}{34}}\\\\log(\frac{1}{500}) = log [(0.5)^{\frac{t}{34}}]\\\\log(\frac{1}{500}) = \frac{t}{34} log(0.5)\\\\-2.699 = \frac{t}{34} (-0.301)\\\\t = \frac{2.699 \times 34}{0.301} \\\\t = 304.8 \ s$

Therefore, the time taken for the radioactive element to decay to 1 g is 304.8 s.

4 0

2 years ago

2 - 2n = 3n + 17 solve n

Masja [62]

Answer:

n = -3

Step-by-step explanation:

2 - 2n = 3n + 17

-2 -2

-2n = 3n + 15

-3n -3n

-5 -5

n = -3

Hope this helps you!!! :)

4 0

3 years ago

Is 40/25 equivalent to 32/20

Artyom0805 [142]

Answer:

Yes, 40/25 is equivalent to 32/20.

8 0

3 years ago

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Two accountants for the firm of Elwes and Wright are arguing about the merits of presenting an income statement in a multiple-st

olchik [2.2K]

Answer:

73,188

Step-by-step explanation:

fees plus costs minus expenses

8 0

3 years ago

6 - 2 1/4 equals 1/2

Mariana [72]

Answer:

no solution

Step-by-step explanation:

6-2.25=0.5

no solution

5 0

3 years ago

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