The difference of 100 and the product of y and 12

can't understand question can you edit it or repost it

Step-by-step explanation:

and please mark me thanks

< 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⭐

yes the total will be same because in both of them the expression.is rearranged but their sign remains the same hence it hss just been shuffled