solve and include ristrictions for: In (In e (ext)) = 4 and 1 e X = 2

A radiation safety officer is working with 112 grams of a radioactive substance. After 17 days, thesample has decayed to 80 grams. Rounding to fivesignificant digits, write an exponential equationrepresenting this situation. To the nearest day, whatis the half-life of this substance?

The half-life of a radioactive material is about 34.2 years. How much of the material is left after 20 years?

An investment account was opened with aninitial deposit of 9,600 and earns 7.4 interest,compounded continuously. How much will theaccount be worth after 15 years?