1.
A certain radioactive isotope decays at a rate of 0.3% annually. Determine the halflife of this isotope, to the nearest year.






2. Wind speed varies in the first twenty meters above the ground. For a particular day f(x)=1.8ln x +3.1 let model the wind speed x meters above the ground. What is the wind speed 11 meter above the ground? Round results to the nearest hundredth.
3. The population of a small country increases according to the function B=2,500,000e^0.02t where t is measured in years. How many people will the country have after 1 years?
4. Use the formula R = log (I/I 