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
a.) z^3+15z^2+23z+30
b.) 2z^3+67z+30
c.) 2z^3+15z^2+23z+30
d.) z^2+ 67z+30
