PLEASE HELP When solving an algebraic expression, our goal is to get the variable on one side of the equal sign.

Isolated

Step-by-step explanation:

When solving one-variable algebraic expressions isolating the variable on one side gives you its value on the other side.

< 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

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step-by-step explanation: