A marathon runner completed 26.2 miles in 2.25 hours. what is his speed
2 answers:
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Answer:
Approximately 3 grams left.
Step-by-step explanation:
We will utilize the standard form of an exponential function, given by:
In the case of half-life, our rate <em>r</em> will be 1/2. This is because 1/2 or 50% will be left after <em>t </em>half-lives.
Our initial amount <em>a </em>is 185 grams.
So, by substitution, we have:
Where <em>f(t)</em> denotes the amount of grams left after <em>t</em> half-lives.
We want to find the amount left after 6 half-lives. Therefore, <em>t </em>= 6. Then using our function, we acquire:
Evaluate:
So, after six half-lives, there will be approximately 3 grams left.
Make a proportion:
Then cross multiply and divide to solve.
20x=119
x=5.95
The answer is $5.95
Then cross multiply and divide to solve.
20x=119
x=5.95
The answer is $5.95