Question 977796
Use a <a href="http://web2.0calc.com/#ln(1/2)">calculator</a> to get ln(1/2) = -0.693147


So ln(1/2) = 5700k turns into -0.693147 = 5700k


Divide both sides by 5700 to isolate k


k = -0.693147/5700 = -0.000122