1) En una casa de campo se crían conejos y gallinas. Si contamos las cabezas son 30 y si contamos las patas son 80. ¿Cuántos conejos y gallinas hay?​

practice. practice. practice.

a

step-by-step explanation:

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis:

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