The amount of substance left of a radioactive element of half life,
after a time, t, is given by:
Given that <span>potassium-40 has a half life of approximately 1.25 billion
years.
The number of years it will take for 0.1% of potassium-40 to remain is obtained as follows:
Therefore, </span><span>the maximum age of a fossil that we could date using 40k is
12.5 billion years.</span>
(2n - 9) - 5(-2.4n + 4) =
The first set of parentheses is unnecessary, so we just drop them.
= 2n - 9 - 5(-2.4n + 4)
Now we distribute -5 by the second set of parentheses. Each term in the parentehses is multiplied by -5.
= 2n - 9 + 12n - 20
Now we combine like terms.
= 2n + 12n - 9 - 20
= 14n - 29
Answer:
constant pro is 5
Step-by-step explanation:
the graph is dircet graph the
we take two point in the graph so
(10,2)
x =ky because k is constant proportional
10 = k*2
2k = 10
k2/2 = 10/2
k = 5
2 minutes 30 seconds - 3 minutes
Answer:
A and C
Hope This Helps! Have A Nice Day!!