The half-life or radium is 517 years. After 4,653 years there is only 7g left. Find how many grams there were at the beginning.

3,590 g

Step-by-step explanation:

Using the formula:

where

remainder after a given time , that is

Original number of radium

, where is the half life , therefore :

= 0.001341

substituting all into the formula , we have :

dividing through by 0.001950

g

Therefore , there are approximately 3,590g of radium at the beginning

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square

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step-by-step explanation: