Answer: D) 13y+15y^2
Step-by-step explanation:
(4y+9y)+(-8y^2-7y^2)=13y-15y^2
4y-8y^2+9y−7y^2
=4y+ −8y^2+9y+ −7y^2
Combine Like Terms:
=(−8y^2+ −7y^2)+(4y+9y)
= −15y^2+13y
