What is the common ratio of the following sequence? -5, -20, -80,

its 4

Step-by-step explanation:

you are multiplying them by 4

< 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⭐

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225