What is the answer to -4/5 + 3/20 =
2 answers:
First, find the LCD of the two denominators.
Multiples of 5: 5, 10, 15, 20
Multiples of 20: 20
The LCD is 20.
Second, make the denominators the same as the LCD. / Your problem should look like:
Third, simplify so that the denominators are the same. / Your problem should look like:
Fourth, combine the denominators. / Your problem should look like:
Fifth, simplify. / Your problem should look like:
Answer as fraction:
Answer as decimal: -0.65
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After 24 hours, 35.4% of the initial dosage remains on the body.
<h3>What percentage of the last dosage remains?</h3>
The exponential decay is written as:
Where A is the initial value, in this case 2.8mg.
k is the constant of decay, given by the logarithm of 2 over the half life, in this case, is:
Replacing all that in the above formula, and evaluating in x = 24 hours we get:
The percentage of the initial dosage that remains is:
If you want to learn more about exponential decays:
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