(solution) 1. A certain radioactive isotope decays at a rate of 0.3%

(solution) 1. A certain radioactive isotope decays at a rate of 0.3%

1.

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

a)  231 years
b)  100 years
c)  167 years
d) 

2 years

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.

a)  7.42 meters per second
b)  1.22 meters per second
c)  5.14 meters per second
d)  5.50 meters per second

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?

a)  4,247,425
b)  2,617,821
c)  9,780,058
d) 

2,550,503

4. Use the formula R = log (I/I

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