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OpenStudy (anonymous):
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. In which year were 502 students enrolled?
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OpenStudy (paki):
make it like -5x² + 72x + 378 = 502... and solve for "x"
OpenStudy (anonymous):
I don't know how
OpenStudy (anonymous):
Can you show me?
OpenStudy (paki):
solve by using the quadratic formula....
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