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How do you know that the sum of [tex]\(-2 \frac{3}{4}\)[/tex] and [tex]\(\frac{5}{9}\)[/tex] is rational?

A. The sum is a terminating and a repeating decimal.
B. The sum is a non-terminating and a non-repeating decimal.
C. The sum is a fraction.
D. The sum is an integer.


Sagot :

To determine whether the sum of [tex]\(\left(-2 \frac{3}{4}\right)\)[/tex] and [tex]\(\frac{5}{9}\)[/tex] is rational, we follow these steps:

1. Convert [tex]\(-2 \frac{3}{4}\)[/tex] to an improper fraction:
- [tex]\(-2 \frac{3}{4}\)[/tex] can be written as [tex]\(-2 - \frac{3}{4}\)[/tex], which is [tex]\(-2.75\)[/tex].

2. Express [tex]\(\frac{5}{9}\)[/tex] as a decimal:
- [tex]\(\frac{5}{9} \approx 0.5555555555555556\)[/tex] (a repeating decimal).

3. Sum the two numbers:
- [tex]\(-2.75 + 0.5555555555555556 = -2.1944444444444446\)[/tex].

4. Determine the nature of the sum:
- The resultant sum, [tex]\(-2.1944444444444446\)[/tex], is a terminating decimal.
- Since it is a terminating decimal, it can be expressed as a fraction, and therefore, it is a rational number.

By follow through each step, we have concluded that:
- The sum of [tex]\(\left(-2 \frac{3}{4}\right)\)[/tex] and [tex]\(\frac{5}{9}\)[/tex] is a terminating decimal, which confirms that it is a rational number.

Thus, the correct statement is:
- The sum is a fraction.