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5730 x 2 = 11460 Is this correct

5730 + 2865 = 8595 Would this answer be right?

I am a parent trying to help my High school freshman daughter solve this problem but I am clueless. I don't just want the answer but if you show me how you got the answer I think I can explain it to...

A fossil was found to have 1/4 the number of Carbon 14 atoms present then when the animal died. The half life for carbon 14 is 5730 years. How old is the fossil?