Y=X(K)
9=2(K)
9/2=4.5
K=4.5
Answer is 4.5
Answer:
A, B, E
Step-by-step explanation:
these will make a triangle
Answer:
The cataclysm occured 6.85x10^8 years ago.
Step-by-step explanation:
Considering that the half-life is 4.51x10^9 years, the first step to solve this problem is finding k by the formula k=ln(0.5)/t(half-life). This constant of decay can then be replaced in the N=No x e^(-kt). Since the problem states that the ratio N/No = 0.9, solving the formula for t will give you a time of 6.85x10^8 years. The question was when did the cataclysm occured so it is safe to say that it was about 685,000,000 years ago.
Answer:
in what do u need help?
Step-by-step explanation: