Please help with the homework: i) It takes _____ half-live (s) to eliminate 99% of the drug in the body after an IV bolu

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Please help with the homework:
i) It takes _____ half-live (s) to eliminate 99% of the drug in
the body after an IV bolus injection. Round the answer to the
nearest tenth.
ii) The salt factor for cocaine sulfate is
0.76. To get a dose that is equivalent to
10 mg cocaine, the amount of cocaine
sulfate that needs to be injected to a patient is _____
mg. Round the answer to the neatest tenth.
Thank you:)