<span>As the age of the U-235 sample is 2.631 billion years, and the half-life of U-235 is 713 million years, the sample has undergone 2.361 X 1,000,000,000 / 713 X 1,000,000 = 3.69 half lives. In each half-life the sample reduces to half its original weight according to the radioactive Half-Life Formula:
ln (Nt /N0) = -kt, where N0 = mass of the original weight of radioactive material, Nt = mass of radioactive material at time t, k = decay constant and t = time interval . We have to put Nt/N0 = 1/2 for time interval = half-life.</span>
Hello :
<span>|x| + 7 < 4.
</span><span>|x| < 4.-7
</span>|x| < -3
no reals solutions because for all reals x : |x| <span>≥ 0</span>
C. 32in. >> 10+10+6+6=32.
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