Answer:
r>=-3
Step-by-step explanation:
 
        
             
        
        
        
 Answer:
12
Step-by-step explanation:
2/3 x + x = 20
2/3 x + 3/3x = 20
5/3 x = 20   ... times 3/5 both sides
x = 12
check: 2/3 x 12 + 12 = 8 + 12 = 20
 
        
             
        
        
        
Your goal is to have x by itself
Send st to other side
rx= r+st
Divide by r so x stays alone
X=(r+st)/r
Which is also equal to
X=r/r+st/r
X= 1+st/r
        
             
        
        
        
Answer:
Log (169)
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
length = 20cm
breadth = 8cm
Step-by-step explanation:
solution;
length(l) = x + 12
breadth(b) = x
perimeter (p) = 56 cm
 we know that,
perimeter(p) = 2(l + b)
or, 56 = 2(x + 12 + x)
or, 56 = 2(2x + 12)
or, 56 = 4x +24
or, 56 - 24 = 4x
or, 32 = 4x
or, 32 / 4 = x
x = 8
now 
putting the value of x in length and breadth
length = x+ 12
 =8 + 12
 =20cm
breadth = 8cm