It i: 2*3*7 = 42
It is: 2, 3 and 7
No, prime factorization of 42 is not 21 x 2 because 21 is not a prime number and it can be further broken into primes as 3 x 7. So prime factorization of 42 is 2 x 3 x 7.
No it isn't. 235/5 = 47 and 47 is a prim number. 235 isn't a prime number so it isn't a prim factorization. The real factorization is 47 * 5.
67 is a prime number
None. 23 is a prime number.
85 = 5 x 17
6834,217,2,2
It is just 11 because 11 is a prime number
19 is already prime; no factorization.
2x2
No.
43 is already prime; no factorization required.