How do you know that the sum of -2 3/4
and 5/9 rational?

Step-by-step explanation:

Since we have given that

and we need to change the mixed fraction into improper :

Now, we need to find the sum of both fractions:

since it is written in form . So, it is a rational number.

As we know that "Rational number is any real number which can be written in the form of ".

power property.

other answer is correct. i had used the radius of the radius somehow. a website: