15. Apply the above formula to the problem of integrating x over the interval [-1,1]. The error in the result i a. 4/15 b. 4/5 c. 1/6 d. 14/15 16. Applying Richardson's extrapolation method to the problem of finding f' (x) when xo f(x)sin(x), and h-0.5 gives (as its first, most primitive approximation): a. 0.00000 b. 0.923712 c. 1.00000 d. 0.95885 17. When using the bisection method to find the zero of the function shown below, the final answer is the root near: a.-0.961355 b. -0.322108 c. 0.525058 d. 0.985091 1.5 0.5 -0.5 18. The scant method generally converges faster (in terms of CPU time) than Newton's method when a requires less time than that required for a floating point multiplication operation c. reires more time than foxo) to evaluate c. (x)requires les time than fx) to evaluate d. f(x) requires l requires more time than f(x) to evaluate ess than half the time required to evaluate fix) umerically the equation, x-0.9 sin(x) -0.2 0, using the Secant Method gives for the approximation x2: 19. When trying to solve n X-1 = 0.5 and Xo = 0.75 as initial guesses, a. 1.04618725 b. 1.70168725 c. 0.90160425 d. 0.80160425