sir i am stuck for this question

Question 15 (0.14 points) The pressure difference of the two ends of a small pipe of cross-sectional radius x is given by P = _ where K is a constant real number. Use differentials to determine by approximately what percentage the pressure P changes if the radius of the pipe is decreased from 2 to 1.96 Enter your answer without the percentage sign. Enter an integer or a fully reduced fraction such as 4 , -16, 3/7 , 1/9 etc. No spaces pleaseQuestion 16 (0.12 points) Let f(x) = In(3x-8) - In(x) + 2 , x 2 3. Find the value of f1(2 Question 17 (0.12 points)