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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 598 students enrolled?
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OpenStudy (anonymous):
-5x^2+72x+378=598
OpenStudy (nurali):
5x² + 72x + 378 = 598 -5x² + 72x = 220 5x² - 72x + 220 = 0 Solving by quadratic formula, x = 4.4 years or 10 years
OpenStudy (anonymous):
The available answers are 1992, 1998, 2000, 2010
OpenStudy (nurali):
1990+10=2000
OpenStudy (anonymous):
Thanks!!
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OpenStudy (nurali):
My Pleasure.
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