Answer:
It would take 54 minutes to the element X to decay to 15 grams.
Step-by-step explanation:
A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay and its given by
where,
= quantity of the substance remaining
= initial quantity of the substance
= time elapsed
= half life of the substance
We know that the element X decays radioactively with a half life of 13 minutes (), there are 260 grams of it () and we want to find how long () would it take the element to decay to 15 grams ().
Using the above formula and solving for , we get that
I think it’s 2, -2 but I am not completely sure. Sorry if it’s wrong if it right pls mark branliest
The answer is 21.17 (2dp)
Hope that helps
Answer:
8y
Step-by-step explanation:
8y
Sum of internal angles of any polygon is: (n-2)x180
So measure of an interior edge is ( ( n - 2 ) x 180 ) / n = 140
So 140n = 180n - 360
40n = 360
n = 9
So it's a nonagon.
Hope this helps :)
