Question

18.

If z = (5)(11)(28)(38), what is the
greatest prime factor of z?
A. 5
B. 7
C. 11
D. 13
E. 19

Answer 1

E. 19

Explanation:

z = (5)(11)(2·2·7)(2·19)

z = 2³·5·7·11·19

The greatest prime factor is 19.