Suppose Y t = 5 + 2t + X t where {X t } is a zero-mean stationary series with authoritarian function k a.)

Suppose Y _t = 5 + 2t + X _t where {X _t } is a zero-mean stationary series with authoritarian function γ k

a.) Find the mean function for {Y _t }

b.) Find the autocovariance function for {Y _t }

c.) Is {Y _t } stationary? Why or why not?