Quiz 

Equations

Let x be the digit in the ones place
10 (6 - x) + x = 3[x(6 - x2)]
60 - 9x = 18x -3x2
3x2 - 27x = -60
x2 - 9x = -20
x2 - 9x + 81/4 = ¼
x - 9/2 = ± ½
x = 5 or 4
 
Tenth value (1st no.): 6 - 5 = 1
Tenth value (2nd no.): 6 - 4 = 2
 
1st no.= 15
2nd no. = 24
 
 
 
Let x be the speed of Ken 
 
     
Speed of Ken is 16.2km/h
Speed of John is 11.2km/h
 
Let x be amt. pulled away
Height of triangle =  
(12 - x)2 + (5 + x)2 = 132 
144 - 24x + x2 + 25 + 10x + x2 = 169
2x2- 14x = 0
a = 2  b = -14  c = 0
   = 0 (n.a.) or 7
 
x is 7m.