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 ".

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right