Econometric Notation: Understanding E (GPA|SAT) and Its Meaning

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So if you have an expression like this, what does the E (GPA|SAT) part mean and how is it read?

E (GPA|SAT) = .70 + .002SAT
 
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Total guess here - expected GPA, given the SAT score.
 

Thread 'Family of lines that are at a distance of 5 from the origin'

I picked up this problem from the Schaum's series book titled "College Mathematics" by Ayres/Schmidt. It is a solved problem in the book. But what surprised me was that the solution to this problem was given in one line without any explanation. I could, therefore, not understand how the given one-line solution was reached. The one-line solution in the book says: The equation is ##x \cos{\omega} +y \sin{\omega} - 5 = 0##, ##\omega## being the parameter. From my side, the only thing I could...
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