5. solve for x.
triangle misdegmants
(4x + 21)*
(13r - 15)*

< 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⭐

use distributive property on all like terms and change your signs if you have a double negative or if you have positive/negative

your answer is  

a.

5

step-by-step explanation:

i'm sorry, what's your question here?