Answer:
Step-by-step explanation:
|2x-3|≤9
so -9≤2x-3≤9
add 3 to each inequality
-6≤2x≤12
divide by 2
-3≤x≤6
 
        
             
        
        
        
The other 6 books can be arranged in 6 ways
= 6*5*4*3*2*1 =  720 ways  answer
        
             
        
        
        
What is that supposed to mean
        
                    
             
        
        
        
Answer:
34 years
Step-by-step explanation:
f = s + 28          Eq. 1
f+8 = 3(s+8)      Eq. 2
f = father age
s = son age
replacing Eq. 1 on Eq. 2
(s+28) + 8 = 3(s+8)
s + 36 = 3*s + 3*8
s + 36 = 3s + 24
36 - 24 = 3s - s
12 = 2s
12/2 = s
s = 6
from the Eq. 1
f = 6 + 28
f = 34
Check
from the Eq. 2
34+8 = 3(6+8)
42 = 3*14
 
        
             
        
        
        
Distance formula: sqrt((x2-x1)^2 + (y2-y1)^2) 
distance = sqrt((-1 -2)^2 + (-5-5)^2)
distance = sqrt(109)
Distance = 10.44