-10-
10
= 4W+ 10 -
10

W=-5

Step-by-step explanatiom:

This has to be right. Im positive.

< 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⭐

you have to put the graph on here with the question

step-by-step explanation: