John has 15 more music cds than micheal together they have a total of 55 cds

Evaluate the expression. (9 + 5)(3 + 2)0

Collin did the work to see if 10 is a solution to the equation r/4=2.4

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