Who can finish this for me

Step-by-step explanation:

Remove unnecessary parentheses

When there is a (-) in front of an expression in parentheses, change the sign of each term in the expression

Collect like terms

Add the numbers

Use the commutative property to reorder the terms

Hope this helps...

Best regards!!

< 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⭐