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​​ACT & SAT practice

Finding the y-intercepts of a circle

12/9/2016

 
In the standard (x,y) coordinate plane, an equation of a circle is x² + y² = 64.  At what points does the circle intersect the y-axis?
A.)  (0,1) and (0,-1)
B.)  (0,8) and (0,-8)
C.)  (0,9) and (0,-9)
D.)  (0,10) and (0,-10)
E.)  the circle does not intersect the y-axis

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Evaluating a function

12/3/2016

 
If f(x) = x² + 3, then f(x + y) = ?
A.)  x² + 2xy + y² + 3
B.)  x² + 2xy + y²
C.)  x² + 2xy + 3
D.)  x² + 3 + y
E.)  x² + y²

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