A used electronics store pays $40 for each cell phone spends $25 refurbishing the phone, and sells the refurbished phone to a customer for $100. Write an expression in simplest form that represents the company’s earnings (in dollars ) from buying processing and selling cell phones use x to represent the number of cell phones they sell

< 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

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