Help please asap!!! Thx

Step-by-step explanation:

# 21.

÷ ( - 0.35 ) = - ÷ = - ÷ = - × = - (B).

# 22.

( - ) ÷ ( - 2.5 )

= = 3.5

= = = 9.75

( 3.5 - 9.75 ) ÷ ( - 2.5 ) = ( - 6.25 ) ÷ ( - 2.5 ) = 2.5 (D).

< 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⭐