Section 6: Functions continue98
For example, to calculate 37 (that is 3 × 3 × 3 × 3 × 3 × 3 × 3):
Keystrokes Display    
3 ENTER  7
– 7 _    
   
g Yx 
– 2,187.000    
   
Or to calculate 19–.0473:
Keystrokes Display    
19 ENTER  
– 19.0000    
   
.0473 CHS 
– .0473 _    
   
g Yx 
– 0.8700    
   
And to calculate (–16.13)3:
Keystrokes Display    
16.13 CHS ENTER  
– 16.1300    
   
3
– 3 _    
   
g Yx 
– 4,196.6534    
   
In conjunction with 1/x , Yx provides a simple way to extract roots. For example, find the cube root of 7: (This is equivalent to 71/3.)
Keystrokes Display    
7 ENTER  
– 7.0000    
   
3 1/x 
– 0.3333    
  Reciprocal of 3.
g Yx 
– 1.9129    
  Cube root of 7.
Example: In her study of fish ladders, Jeanneau Colly must determine the rate of water flow down a short spillway on the upper Umpqua River. If the average rate is too great, the salmon run op the Umpqua will be disturbed. Colly finds that the following equation gives the approximate rate of water flow down that spillway:
 
  V  =  [(1.49/0.015) 1.94.67] (sin 38)1/2