Help plz. 6th grade math

2.5z^2+3z+4.2

Step-by-step explanation:

I’m not quite sure what the question is but i’m guessing you need to simplify, if not lemme know and i’ll try help.

first combine the squared terms which is 1.5z^2+z^2= 2.5z^2

second combine the z terms
6z-3z=3z

then combine the numerical terms
4.5-0.3=4.2

so simplified that equation is
2.5z^2 + 3z + 4.2

You sure this is middle school math.. cause this doesn't make sense.