Answer:
15cm
Step-by-step explanation:
because length is given as 8 cm and perimeter is length+width+length+width 
so if you take 8cmX2 since its taken twice to get the perimeter and 15cmX2 you get 46cm which originally the question said was the peemiter
 
        
                    
             
        
        
        
Answer:
41
Step-by-step explanation:
x² = 40²+9²
 = 1600+81
 = 1681
x= √1681 = 41
 
        
             
        
        
        
D. 1/3 
A cube root can be written as an exponent: 1/3
![\sqrt[3]{x} = x^{\frac{1}{3} }](https://tex.z-dn.net/?f=%5Csqrt%5B3%5D%7Bx%7D%20%3D%20x%5E%7B%5Cfrac%7B1%7D%7B3%7D%20%7D)
 
        
                    
             
        
        
        
4(3w+5)-2w=70
10w+20=70
10w+20-20=70-20
10w=50
10w/10=50/10
w=5
        
                    
             
        
        
        
Answer:
C
Step-by-step explanation:
:)