Let = 0.2−1 + be an autoregressive process of order 1, where is a white noise

with mean zero and variance 2.

a) Use Backward Shift operator to express it in terms of

b) Show that the process is stationary

c) Find the ACF

d) Obtain the correlogram

Which statements describe the solutions to the inequality x< -20 check all that apply. there are infinite solutions. each solution is negative. each solution is positive. the solutions are both positive and negative. the solutions contain only integer values. the solutions contain rational number values.

What is the distance from (–3, 1) to (–1, 5)? round your answer to the nearest hundredth. (4 points) a. 3.60 b. 4.12 c. 4.47 d. 5.66

The angle of elevation from point a to the top of the cliff is 38 degrees. if point a is 80 feet from the base of the cliff , how high is the cliff ?