<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>
= 7 2/5 - 1 4/5
= 37/5 - 9/5
= 28/5
In short, Your Answer would be: 28/5 or 5 3/5
Hope this helps!
Answer:
The total number of pants in Mary's closet = 15
Step-by-step explanation:
Here, given:
40% of slacks in her closet = 6 pairs
Let us assume the total pants in her closet = m
So, according to the given data:
40% of m = 6 pairs
⇒ m = 15
Hence the total number fo pants in her closet = 15
Answer:
You could use the equation y = mx + b to solve this problem. The m would equal 7.5 and the be would be zero, so the equation would be y = 7.5x + 0. Add values for x and you would get y.
Answer:
4 is the correct answer
Step-by-step explanation:
|-7| = 7
|3| = 3
7 - 3 = 4