haleigh412 haleigh412 28-06-2016 Mathematics contestada which is equivalent to this expression (z+6)(2z^2+3z+5) a.) z^3+15z^2+23z+30 b.) 2z^3+67z+30 c.) 2z^3+15z^2+23z+30 d.) z^2+ 67z+30