determine the highest real root of f(x)= 0.95x^3 - 5.9x^2 +10.9x-6: (a)graphically. (b) using the newton raphson method(three iterations, xi= 3.5). (c) using the secant method(three iterations, xi-1= 2.5 and xi= 3.5). (d) using the modified secant method(three iterations, xi= 3.5, delta=0.01).