Potassium-40 has a half life of 1.251×billion<span> years</span><span>. To determine the percentage potassium-40 remaining after 3.9 billion years, divide
3.9 by 1.251, = 3.12.
This is the number of times the original amount of potassium-40 reduces by 50%. The remaining percentage is therefore 100%/(3.12 * 2) = 16.03%.</span>
<span>Creativity helps a scientist by allowing him or her to
write more interesting lab reports, draw better diagrams for reports, look at old problems in new ways and pick interesting observations to include as data.</span>
Which is the first indicator of an infection in the body?
<span>
B. an increase in the number of WBCs in the blood</span>
