What operation would you use to cancel out the "9 in the equation 9x= 54"? *

Division

Step-by-step explanation:

This is because right now you are multiplying 9 by the x. So we have to divide by both sides to get the x variable by itself.

< 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⭐