MATH 1241 Test Review -Module 2 Sec 2.3 - 2.8 21. The volume of a sphere is given by V = = mr3. i. Find the differential of V. ii. Use the differential of V to approximate the change in the Volume as the r value is increased from 4 to 4.1 inches. (Don't forget units!) 22. Find the linear approximation to f (x) = 4vx? + 24 atx= 1 and use it to approximate f (1.1) L(x) = f (1.1)