Please help it is due tomorrow

Segment xz is bisected by point y. if xy = 12x, and the measure of xz = 18x – 6, solve for x

Mr.walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236