Respuesta :

Answer: D) 13y+15y^2

Step-by-step explanation:

(4y+9y)+(-8y^2-7y^2)=13y-15y^2

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4y-8y^2+9y−7y^2

=4y+ −8y^2+9y+ −7y^2

Combine Like Terms:

=4y+ −8y^2+9y+ −7y^2

=(−8y^2+ −7y^2)+(4y+9y)

= −15y^2+13y