Radioactive Decay and Half-Lives

If radon has a half-life of 0.38 days, how many times does it halve in 7.6 days?

What was the original mass of the radon sample if 6 grams remain after 7.6 days?

How much of a 100-gram sample of caesium-137 remains after 128 years?

How many half-lives have passed for a caesium-137 sample in 128 years?

What is the age of a fossilized sample if it originally contained 96 kg of carbon-14 and now contains 3 kg?

How many times has the carbon-14 sample halved if it now contains 3 kg?

What is the half-life of germanium-66 if a 48-gram sample reduces to 3 grams in 10 hours?

How long will it take for 1 gram of strontium-90 to decay to 250 milligrams?

How many billion years will it take for uranium-235 to decay from 600 kg to 7.5 kg?

How many times does uranium-235 halve to reach 7.5 kg from 600 kg?