Which rules were used to make the image? please help (don't give links because I know you're trying to scam me)

Simplify.7x + 3y - 2 + 6x + 1 + y squared 2 you! ; )

Which of the following expressions is equal to 2x^2+8

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