What is the recursive rule for this geometric sequence? 1, 3, 9, 27, enter your answers in the boxes. an= (blank) *an-1 a1= (blank) someone explain, i don't understand this one.

Is the an=1•3n-1

< 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⭐