Please solve 4 and 5 completly

Homework 9 4. (6349 #4 p. 114) Use the fact that dy is approximately equal to Ay to find an approximate value of /27.8. Use Ay = /27.8 - $27. 5. (6375 #1 p.239) Consider the function f(x) = 13 - 712 + 25x -35. (a) Setup the Newton's method formula that can be used to estimate where f (r) = 0. In+1 = (b) Find f(1), f(2), f(3), and f(4), then use these values to make an appropriate choice for your initial estimate :1- (c) Find the solution to r' - 7x- + 25r - 35 =0 correct to six decimal places