Answer:
t = 15825.11 years
Step-by-step explanation:
From the given information:
We can make use of the activity of the sample present after time "t" to determine the age of the sample.
This can be expressed by the formula:
--- (1)
where;
= activity of the sample at time t = 0
= disintegration constant
If we replace the value of into equation (1), we have:
By rearrangement:
t = 15825.11 years
Answer:
40 hours
Step-by-step explanation:
First take 165 -25 to get 140. Next divide 140 by 3.5 ($3.50) to get 40. To check multiply 40 times 3.5 to get 140 and add the $25 bonus to reach 165.
It’s congruent because both of the shapes are very similar to each other.