Respuesta :

devishri1977

Answer:

y² +9y

Step-by-step explanation:

Area of triangle:

base = y +9

height = 2y

[tex]\sf \text{Area of triangle = $\dfrac{base *height}{2}$}[/tex]

                         [tex]\sf =\dfrac{(y+9)*2y}{2}\\\\ = (y + 9) * y[/tex]

                         [tex]\sf = y*y + 9*y\\\\ = y^2 + 9y[/tex]

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