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ivanzaharov [21]
3 years ago
15

Suppose the half-life of a certain radioactive substance is 12 days. Find the time when there will be 20% of the initial substan

ce remaining. Assume you have 1 gram of the original substance.
pls help, it due today
Mathematics
1 answer:
vazorg [7]3 years ago
7 0

Answer: 2.4% I think

12 x 20 / 100 = 2.4%

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The population of rabbits on an island is growing exponentially. In the year 1990, the population of rabbits was 1200, and by 19
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Answer:

2023 rabbits

Step-by-step explanation:

The exponential model consists of the following expression:

y = A \cdot r^{t}

Where:

A - Initial population.

r - Increase rate.

t - Time

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The initial population and increase rate are, respectively:

1200 = A \cdot r^{0}

A = 1200

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r^{4} = \frac{17}{12}

r = \sqrt[4]{\frac{17}{12} }

r \approx 1.091

The exponential model that predicts the population of rabbits is:

y = 1200\cdot 1.091^{t}

Lastly, the expected population for the year 1996 is:

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5 0
3 years ago
I need help with this question 1/2 + 2 3/4=?
enyata [817]

Answer:

3.25

Step-by-step explanation:

6 0
3 years ago
A car is traveling at a rate of
LUCKY_DIMON [66]

50 meters per second

3600 seconds per hour

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8 0
3 years ago
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The weather forecast for next season calls for a 10% chance of wind, a 20% chance of rain, a 30% chance of clouds, and a 40% cha
damaskus [11]

wind is predicted for 9 of the days.

rain is predicted for 18 of the days.

cloudiness if predicted for 27 of the days.

sunshine of predicted for 36 of the days.


4 0
3 years ago
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Find the value of angle BAC​
julsineya [31]

Answer:

The value of angle BAC = 75°

Step-by-step explanation:

=> Angle BAC + 105° = 180°

=> Angle BAC = 180° - 105°

=> Angle BAC = 75°

7 0
2 years ago
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