Science:Math Exam Resources/Courses/MATH110/December 2017/Question 08 (b) (i)/Statement

A second bacteria culture (containing a slow growing bacterium) has size ${\textstyle \displaystyle B(t)={\frac {4t+3}{1+t}}}$ bacteria at time ${\textstyle t}$ (in days).

(i) How fast is the culture growing (in bacteria per day) 1 day after the culture was first established?