True or false?
10 ( b + 4c ) = 10b + 40c

True

Step-by-step explanation:

Use distributive property...

10(b + 4c) =  10*b + 10*4c

which simplifies to

10b + 40c

True

The left side is equal to the right side, which means that the given statement is always true

< 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⭐