The answer is 825
hope i could help you
Answer: 
Step-by-step explanation:
We know that the general form of the exponential decay formula is
, where y is final amount remaining after t time, A is the original amount and r is the rate of decay
Now, the ratio of strontium-90 remaining, p , as a function of years, t , since the nuclear accident. 
Hence, the ratio of remaining since the nuclear accident is
The graph is not a direct variation because the line does not go through the origin; option C.
<h3>What is a direct variation?</h3>
A direct variation is a relationship between two or more quantities in which as one quantity increases, the other quantity also increases. Similarly, if the other quantity decreases, the other decreases as well.
For the graph of a direct variation, the line must pass through the origin.
Therefore, the graph does not represent a direct variation because the line does not go through the origin.
In conclusion, direct variation involves a corresponding increase or decrease in two related quantities.
Learn more about direct variation at: brainly.com/question/2633726
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3/4 - 3/5
common denominator is 20
15/20 - 12/20 = 3/20
3/20 is your answer
multiply the opposite denominator with current numerator to get your new numerator number
hope this helps
Answer:
2min per lap
Step-by-step explanation:
