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Rearranging Formulas 

Answers to pre-test
1.      
2.     
3.     
4.     
5.     
6.     
7(a)  ;     h = 
7(b) 
7(c)  The height in (b) is only of the height in (a). This
         is because we are dividing by the square of the
         radius. Thus if the radius is 2 times as big, the height
         is or as much.