Math show work 1. 10m^{5} +5m^{4}-25^{2} factor completely 2. x^{2} - 18x +81 3. 9x^{2} -49y^{2}

answer: a.   one is a factor of every whole number since every number is divisible 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⭐