1.  There are 520 animals on a farm. Threefourths of them are cows. Of the cows, about 90% are white. How many cows on the farm are not white? 

Hint
Halfnhalf Clue
 

2.  If x is negative and (x  3)^{2} = 36, then x^{2} is equal to 
 Halfnhalf Clue
 

3.  If a line segment is drawn connecting point A (3, 6) and point B (9, 10), then the coordinates of the midpoint are 
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4.  A university has 3000 graduate students. The number of undergraduate students is 7 / 6 times the number of graduate students. What fraction of the students in the university are undergraduates? 
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