Is the following a valid UPC number? If not what is the value that should be the "check digit"? 442578105204

a. yes, the number is valid
b. no, the "check digit " d should be 2
c. no, the "check digit" d should be 5
d. no, the "check digit" d should be 1

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x

Alocal hamburger shop sold a combined total of 601 hamburgers and cheeseburgers on friday. there were 51 more cheeseburgers sold than hamburgers. how many hamburgers were sold on friday? a local hamburger shop sold a combined total of hamburgers and cheeseburgers on friday. there were more cheeseburgers sold than hamburgers. how many hamburgers were sold on friday?

Iknow the square root of 2 is irrational