Chapter 8.3, Problem 27P

To determine

To calculate:

The value of the function $f\left(52,108\right)$ when for a function $f\left(r,s\right)$

$f\left(50,100\right)=5.67,f_r\left(50,100\right)=0.60\text{ and }{f}_s\left(50,100\right)=-0.15$.