How do you know that the sum of open paren negative 2 and 3 fourths close paren and 5 ninths is rational?

Both numbers, −2¾ and 5/9, are rational because they can be written as fractions. Their sum is −11/4 + 5/9 = (−99 + 20)/36 = −79/36, which is a fraction. Therefore, the sum is rational; the correct choice is “The sum is a fraction.”

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