need help with a,b,c,d

4.36 Consider the following discrete-time signal. x = [10, -5, 20, 0, 15) (a) Using (2.8.2), find a linear auto-correlation matrix D(x) such that rxx = D(x)x. (b) Use D(x) to find the linear auto-correlation ra(k). (c) Using Definition 2.5, find the normalized linear auto-correlation pu(k). (d) Find the average power P. D(x) = 1 5 x(0) x(1) X(2) 0 0 0 x(0) x(1) X(2) 0 0 0 x(0) x(1) x(2) 0 0 0 x(0) x(0) x(1) 0 0 0 0 x(0) (2.8.2) DEFINITION Let y(k) be an L-point signal and let x(k) be an M-point signal where M = L. Then the linear cross-correlation of y(k) with x(k) is denoted rx(i) and defined 2.5 Linear Cross-correlation 12-1 "jx(k) 12 y(i)x(i k), Osk