If 4x = 8x - 1 then 4x must be equivalent to 1. So that means x is .25 or 1/4.
Hope this helps!
(I assumed your trying to solve for x, please word the question better next time)
        
                    
             
        
        
        
Cot = Cos/Sin
Cos = 12/13
Sin = 5/13
Therefore, 12/3 divided by 5/13 equals 12/5
Answer is 1. 
        
                    
             
        
        
        
Answer:
1. A sound wave in air has a frequency of 262 Hz and travels at a speed of 330 m/s.
2. Sound has a speed of 340 m/s in air at room temperature. 
3. A wave has a frequency of 500 Hz and a wavelength of 
4. The speed of light is 3.0x10^8 m/s, calculate for the frequency.
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Use the equation of motion under gravity:-
s =  16t^2    where s is the distance and t = time
2063 = 16t^2
t^2 = 2063 / 16 =  128.94 s
t = sqrt 128.94  =  11. 4 seconds to the nearest tenth of a second