Suppose that {Yt } is stationary with autocovariance function γk. (a) Show that Wt = ∇Yt = Yt − Yt − 1 is stationary by finding the mean and autocovariance function for {Wt }. (b) Show that Ut = ∇2Yt = ∇[Yt − Yt−1] = Yt − 2Yt−1 + Yt−2 is stationary. (You need not find the mean and autocovariance function for {Ut }.)

30 units^2

step-by-step explanation:

area is l × w

the length is 3

and the width is 10

3 × 10= 30 units squared

example 2 – simplify: step 1: completely factor both the numerators and denominators of all fractions. step 2: change the division sign to a multiplication sign and flip (or reciprocate) the fraction after the division sign; essential you need to multiply by the reciprocal. step 3 : cancel or reduce the fractions.

where's the diagram?

step-by-step explanation: