Hey cellae.

Hint: If something is unbiased then the expectation of the estimator is equal to that parameter. So if your estimator is for the mean then the estimator is X_bar and E[X_bar] = mu for unbiased-ness. Consistency means that the variance of the estimator goes to 0 as the sample size increases (the variance decreases with higher sample sizes).

For your problem, replace X_bar with Beta_hat.