<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>
Answer: 180 feet
Step-by-step explanation:
Given: A 50-foot flagpole is at the entrance of a building that is 300 feet tall.
Them two right triangles must be formed by flagpole and building with the ground and are similar because the angle of the sun is the same at the same time of day.
So by the properties of similar triangles,
1) All the three angles of each triangle must be equal to a corresponding angle of the other triangle.
2) Sides are proportional to the corresponding sides in the other triangle,

Therefore, the length of building's shadow is 180 feet.
Answer:
15
Step-by-step explanation:
Answer:
Table C
Step-by-step explanation:
Given

Required
Which table is correct
We have:

For 7 packages, it will be:
--- i.e. 6 * 7
For 8:
--- i.e. 8 * 7
For p packages

<em>Using the above formula, we can conclude that table (C) is correct</em>