For these problems, use the formula Final mass x 2^H = Original mass, where H= # of half lives

4. If carbon-11 has a half life of 20 minutes, how long would it take for 1000g to decompose down to 31g?

5. If 40g of Rhodium-101 decompose down to 5g in 9 years, what is the half life of Rhodium-101?

6. Einsteinium-255 has a half-life of 40 days. What was the starting mass if there are 15g left after 200 days?

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them  

you need to stop taking that class