If m and n are real numbers such that 4m + n = 10, then which of the following expressions represents m?

a.10 plus n, divided by 4
b. 10 minus n, divided by 4
c. 10 divided by 4, minus n
d. 10 minus n, times 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⭐