What was the 1-hour growth factor for the bacteria's mass?

A radioactive element is known to decay at a rate proportional to its present mass. Initially, there is 0.0675 grams of the element. Three hours later, the remaining mass is 85% of its original mass. a. Compute the mass(in milligrams) of the element after 3.5 hours. Determine the time at which the element has decayed to one half of its initial mass.

Complete the below equation keeping in mind the to the eleventh power and explain how to calculate the interger. AGE = ln (0.2563 + 1)/ 1.42 x 10-11 yearsAGE = ln (1.02563)/ 1.42 x 10-11 years AGE = ? / 1.42 x 10-11        =?   Years

What is the value of ln ( e8)?