Brendan looks around at an assembly. He notices his younger sister to his right and his older brother 20 meters ahead of him. If Brendan's brother and sister are 25 meters apart, how far apart are Brendan and his younger sister?

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