What percentage of a radioactive species would be found as daughter material after five half-lives?

The answer is 3.125%.

The relation between number of half-lives (n) and amount of sample that remained (x) can be expressed as:


It is given:
n = 5

To find x, we will change n in the equation with five:


⇒ 
⇒ 
⇒

Therefore, 3.125% of a radioactive species would be found as daughter material after five half-lives.

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's