Respuesta :

celesteortizavila

Answer:

width : x+4

Step-by-step explanation:

(x+9)(x+4) = x^2+4x+9x+36

x^2+13x+36

think of numbers that multiply together to get 36

and of those number, what numbers add up to 13

9 times 4 equals 36

9 plus 4 equals 13

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