Please help me with this mystatistics problem. I don't know how to answer it.

Let Y1, ..., Yn be i.i.d. samples from the density function fo (y ) = - ry' -y'/1020, 20. Here r > 0 is a known positive constant. (a) Find the MLE of 0. (b) Using the asymptotic theory of the MLE, find the limiting distribution of the MLE. (c) Using (b), form an asymptotic two-sided 1 - o confidence interval for 0