The square of r increased by a quantity that is fifty times the cube of k

Our required expression would be

Step-by-step explanation:

Since we have given that

The square of r increased by a quantity that is fifty times the cube of k

Square of r means

cube of k means

50 times the cube of k means

increased by is expressed by addition operator.

So, our equation becomes,

Hence, our required expression would be

< 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⭐

215.92 dollars is the answer