Science:Math Exam Resources/Courses/MATH110/December 2017/Question 08 (b) (ii)/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).

(ii) At ${\textstyle t=1}$, is the culture’s growth rate increasing or decreasing?