Can anyone please help me with these two been working on them and no clue

Hurry which expression is equivalent to 3√x^5y?

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

An equation in slope-intersept form the lines that passes thought (-8,1) and is perpindicular to the y=2x-17.