Answer:
A) 277 million years
Step-by-step explanation:
Here, decay of U-238 is first order reaction. (since most of the nuclear decays are first order).
so, the equation t = 
× ln(
)
where, t = time from start of reaction
k = reaction constant
A(0) = initial concentration; A = present concentration.
⇒ 4.5 billion = 4500 million years = × ln2.
Now, given 95.82% of parent U-238 isotope is left.
⇒ t = × ln()
t = 
× ln(
)
⇒ t ≅ 277 million years.
First, we can use the points (4,3) and (20,15) to find the slope of the line:
Now we can find the relation function using the point (4,3) and the slope s=3/4
therefore, the equation to describe the relationship between J and M is m=3/4j
Answer:
150%
Step-by-step explanation:
To find percentage, divide one number by the other.
39/26 = 1.5
1.5 written as a percentage is 150%
Answer:
625000
Step-by-step explanation:
x+12%= 700000
x*1.12=700000
x=700000/1.12
x=625000
