The angle measure (120°) is the average of the measures of the two arcs (x, 2x). Hence
.. (x +2x)/2 = 120°
.. 3x = 240°
.. x = 80°
        
             
        
        
        
39. 
9.2 x 10^3, 10,000, 1.8 x 10^4
40.
0.005, 5.25 x10^-3, 5.0 x 10^-2
        
                    
             
        
        
        
Answer:
Just like combining like terms with the same variables, you combine like 
radicals with the same number under the radical signs.
Step-by-step explanation:
Example:
3x + 2x 
= 5x   {combined like terms}
3√2 + 2√2
= 5√2   {combined like radicals}
 
        
             
        
        
        
<span>a³-b³=(a-b)(a²+ab+b²)
64x⁶ - 27
64 = 4³, 
x⁶ = (x²)³
27 = 3³
</span>64x⁶ - 27 = 4³(x²)³ -3³ = (4x²)³ -3³.  Now, we can use a formula where a=4x², b=3
(4x²)³ -3³ = (4x² -3)((4x²)² +4x²*3 + 3²) =  (4x² -3)(16x⁴ +12x² + 9) 
<span>
Answer: </span>64x⁶ - 27=  (4x² -3)(16x⁴ +12x² + 9) <span>
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They are the same because if you add a zero it doesnt change it