In this type of question, we will use the exponential equation
[tex]y=a(b)^x[/tex]Where:
a is the initial amount
b is the factor of growth or decay
Since it is a half-life, then
b = 1/2 = 0.5
Since it is now 50 grams, then
a = 50
Since x is the number of years, then
x = 700
Substitute them in the rule above
[tex]\begin{gathered} y=50(0.5)^{700} \\ y=0 \end{gathered}[/tex]It will be representing 0 grams after 700 years
The answer is A
