Use GoogleSheets and Newton's method to approximate the zeros to three decimal places for the following:

1. y = x3 - 19                                     x0 = 3

2. y = ln(x) - (x2-4)                           x0 = 1 AND x0 = .005 

3.    6x - (1-x^2)^(1/2)                     x0 = 0

4. y = cos(x) - x2                               x0 = 1 AND x0 = -1