plz show all work ans weite neatly

and i dont have any pic left can you do both of them thank you

2. Your stock market investment has a half life of 1 day. Your current investment is $10,000. You would like to take your family on a nice vacation to prove how smart of an investor you are. How many days will it take before you cash in your investment and still have $1200 left over for the trip? 7. A substance N1 decays with a half-life of 45 seconds to substance N2. N2 has a half-life of 5 minutes and decays to the stable substance N3. Model the system (but do not solve the equations) if initially, there are 40 grams of N1, 20 grams of N2, and 12 grams of N3