please answer these two questions ..calculus

Problem 13. (1 point) Let y = 2VI. Find the change in y, Ay when z = 2 and Ar = 0.2 Find the differential dy when z = 2 and dr = 0.2 Note: You can earn partial credit on this problem. Problem 14. (1 point) Consider the function f(x) = vx - 1 (A) Find f-1(1) = (B) Use Theorem 7, page 156 of the Stewart Essential Calculus textbook to find (f !)'(1) (f-1)'(1) = (C) Calculate f (x) and state domain and range of f 1 Use interval notation. If needed enter inf for co or -inffor -co. f- 1(x) = Domain = Range = Calculate (f 1)'(1) from the formula for f 1() and check that it agrees with the result of part (B)