Help me pls

What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges

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

Subject: geometryneed with 6 and 7