The equation - 5x² + 72x + 378 models the number of students enrolled in a school where x is the number of years since the school first opened in 1990. which equation can be used to find the year in which 502 students were enrolled?
a. - 5x² + 72x - 124 = 0
b. - 5x² + 72x + 502 = 0
c. - 5x² + 72x - 502 = 0
d. - 5x² + 72x + 124 = 0

< 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⭐

a

step-by-step explanation:

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