Question: please help with part A and B How long will it take for 22% of the U-238 atoms in a sample of U-238 to decay?

please help with part A and B

How long will it take for 22% of the U-238 atoms in a sample of U-238 to decay? Express the time in years to two significant figures. is Incorrect; Try Again Part B If a sample of U238 initially contained 6.11018 atoms and was formed 4.3 billion years ago, how many U238 atoms does it contain today? Express the number of atoms to two significant figures

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