Answer:
He is trying to figure out its age.
Explanation:
Rex is finding a strange and very interesting form of a rock. He took a small sample in order to do research. He was trying to measure the amount of radioactive uranium with the radioactive lead.
This way he wanted to show how fast are these objects falling apart depending on the chemical elements they contain.
The equilibrium reactions pertinent to an aqueous solution of Ag2CO3 in which physical states are not considered is:

<h3>What are equilibrium reactions?</h3>
An equilibrium reaction is a chemical reaction process in which the reactants remain in a steady and stable condition both previously(reactant) and after the reaction is completed(product).
A reaction is considered to be at thermodynamic equilibrium when a reaction meets all three categories of equilibrium;
- Equilibrium of temperature
- Equilibrium in the chemical reaction.
- Equilibrium with the surrounding factors like pressure.
The equilibrium reactions pertinent to an aqueous solution of Ag2CO3 is:

Learn more about equilibrium reactions here:
brainly.com/question/1619133
Answer:
299m + 261j >= 1000
Explanation:
The inequality equation is basically the mg of per glass of milk times the m cups of milk + mg per glass of juice times the j glasses of juice should be greater than or equal to required 1,000 mg per day