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mamaluj [8]
2 years ago
13

A radioactive isotope has a rate of decay of 84%. that is, every day,

Mathematics
1 answer:
Paul [167]2 years ago
7 0

The half life of the radioactive isotope to the nearest tenth is  0.83 days.

<h3>What is rate of radioactive decay?</h3>

The rate of radioactive decay is the rate at which a radioactive isotope is disintegrated. The half life is the time taken for half of the original amount of radioactive isotope to remain.

Given that;

t/12 = 0.693/k

Where;

t1/2 - half life

k =decay constant

t/12 = 0.693/0.84

t/12 = 0.83 days

Learn more about half life:brainly.com/question/24710827

#SPJ4

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A ball is chosen at random from a bag containing 150 balls that are either red or blue and either dull or shiny. There are 36 re
tino4ka555 [31]

Answer:

The probability of the chosen ball being shiny conditional on it being red is; 0.375

Step-by-step explanation:

Let A be the event that a red ball has been chosen

Let B be the event that a shiny ball has been chosen

Let S be the total outcomes = 150 balls

Thus;

P(A ∩ B ) = 36/150

A ∩ B' = 150 - 36 - 54

A ∩ B' = 60

Thus; P(A ∩ B') = 60/150

P(A') = 54/150

P(A) = (150 - 54)/150 = 96/150

Thus, probability of the chosen ball being shiny conditional on it being red is;

P(B | A) = P(B ∩ A)/P(A)

Thus; P(B | A) = (36/150)/(96/150)

P(B | A) = 0.375

8 0
2 years ago
What is -(3/7) x (-1/6)?
krok68 [10]
The answer is 1/14. -3/7 x -1/6. 3 crosses 6 2 time so you are left with -1/7 x -1/2 that is 1/14
3 0
3 years ago
Rhombus with diagonal lengths 9 ft and 4 ft. ( what's the area ? )
Alexeev081 [22]

Answer:

18

Step-by-step explanation:

4 0
2 years ago
What is 138 rounded to the nearest hundredth
serg [7]

Answer:

hundred and hundredth are way different 11.75 I think it would be tho

Step-by-step explanation:

4 0
3 years ago
Ivan and Tanya share £150 in the ration of 4:1
Zarrin [17]

Answer:

Money Ivan gets   extra = 120 - 30 (or 3x) = 90

Step-by-step explanation:

Ivan = 4x

Tanya = 1x

Total = 150

4x + x = 150

5x = 150 ;  x = 150 / 5 = 30

Ivan = 4x = 120

Tanya = 1x = 30

Money Ivan gets   extra = 120 - 30 (or 3x) = 90

8 0
2 years ago
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