Answer:
167.27 mg.
Step-by-step explanation:
We have been given that the half-life of Radium-226 is 1590 years and a sample contains 400 mg.
We will use half life formula to solve our given problem.
, where N(t)= Final amount after t years, 
= Original amount, t/2= half life in years.
Now let us substitute our given values in half-life formula.
Therefore, the remaining amount of Radium-226 after 2000 years will be 167.27 mg.
Answer:
it means divide it by 1/4 or multiply by .25
Step-by-step explanation:
First you need to write the numerical equation for the given:
When you will simplify this fraction, you can divide the expressions. Based on the law of exponents when you divide like terms with different exponents, you can subtract the exponents of the denominator from the numerator.
So if you will simplify the equation:
Subtract the following:
Exponents of a 7-4 and;
Exponents of b 8-4
Your answer should be
Answer: $8.2
Step-by-step explanation:
