The remaining amount after 4 years is 1.25 kg
<h3>How to determine the remaining amount?</h3>
The half life of a function is represented as:

Where
Ao represents the initial amount
So, we have:

In 4 years, t = 4.
So, we have:

This gives

Evaluate the expression
A = 1.25
Hence, the remaining amount after 4 years is 1.25 kg
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Answer:
k = 12
Step-by-step explanation:
Given in the question,
Cost of the the movie tickets is proportional to the number of tickets sold.
Cost of movie tickets (C) ∝ number of tickets sold (T)
C ∝ T
C = kT
Here 'k' is a proportionality constant.
Since, line given in the graph passes through a point (5, 60)
60 = k(5)
k = 
k = 12
Therefore, value of proportionality constant is 12.
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Step-by-step explanation:fhnhnyhtymtjmtjmtjmtjmtmjtjtmtm

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