<span> 72 + 78 + 70 + x is less than or equal to 289</span>
        
                    
             
        
        
        
PhotosRemaining(x) = 745 pictures - (20 pictures/day)*(x), for x≥0
 
        
             
        
        
        
It’s 125 because 5 over 3 is 5 (3) times so 5x5x5= 125 hoped this helped.
        
             
        
        
        
Answer:
There are seven seventh roots of unity, e2πki7 , all on the unit circle, r=1 above. 
The first one is at θ=2π7=360∘7=5137 ∘ , and there are others at 4π7,6π7,8π7,10π7,12π7 and of course at 0 radians, i.e. unity itself.
How to find?
There are 4 fourth roots of unity and they are 1, i,−1 and−i
 Each of the roots of unity can be found by changing the value of k k k in the expression e 2 k π i / n e^{2k\pi i/n} e2kπi/n. By Euler's formula, e 2 π i = cos  ( 2 π ) + i sin  ( 2 π ) = 1.
 
        
             
        
        
        
A closed dot mean "greater than or equal to" or "less than or equal to"
An open dot means "less than" or "greater than"
In this case, an open dot would mean 
X>-2