3a^5 x 5a^3 divided by 10a^4

1.5 a^4

Step-by-step explanation:

taking only numbers 3*5=15

15/10 = 1.5

taking a powers

a ^ (5+3-4)= a^4

1.5 a^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⭐

the answer is d on edge

step-by-step explanation: