Select all of the expressions that are factors of −10x2+x+21 . answer choices x2 −5x−7 5x−3 2x−3 −2x−21

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