Answer:
The answer is x=15/2
Step-by-step explanation:
Answer: First multiply 10 by 20.5 because x represents the number of weeks. You get 205. Next add 165.85 to that and you get 370.85 as your final answer.
Step-by-step explanation:
Answer:
Step-by-step explanation:
<u>Formula is given</u>
<u>If C = 15 yd, π = 3.14, then r is</u>
- C = 2πr
- r = C/2π
- r = 15/(2*3.14) = 2.39 yd rounded to the nearest 100th
Answer:
Line YV.
Step-by-step explanation:
A line contains two infinite arrows, no endpoints.
To solve this question we will use two important formulas.
The first formula involves the calculation of the decay constant, 
which is to be found as:
where 
is the half life of Pb-210 which is given to be 22 years in the question.
Thus, 
Now, we will use the second formula which is called the function of decay formula and is given as:
where 
percentage of Pb-210 remaining in the bone at present, which in our case is 67% or 0.67
percentage of Pb-210 to start with, which is always 100% or 1.
Plugging in all these values in the decay formula we are supposed to find the time, 
.
Taking natural log on both sides we get:
years
Therefore the bone fragment is about 12.71 years old.
