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. How many students did the school have when it opened?

Question

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. How many students did the school have when it opened?

anonymous · Answer

What's you're y-intercept in this problem?

anonymous · Answer

Whatever is your y-interecept, is your answer.

anonymous · Answer

Based on the fact that when they first opened, we were 0 years away from the opening year (1990).  x always represents time in linear equations.  So if we plug in a 0 for our x's, all terms that have x's next to them are eliminated.  Leaving us with only one number on the right-hand side...the y-intercept.

anonymous · Answer

y = -5(0)^2 + 72(0) + 378

y = ???

anonymous · Answer

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