-2 < 4x - 10 < 6
+10. +10. +10
8 < 4x < 16
÷4. ÷4. ÷4
2 < x < 4
        
                    
             
        
        
        
She buys 24 dvds in 12 weeks.
        
                    
             
        
        
        
Answer: 7/8
Cos2x has 3 formulas, Sinx is given in the question, we should use the formula with sinus. I guess that's the solution. 
 
        
             
        
        
        
It would be 9 because 2x9=18. Then 18+-2=16.
        
                    
             
        
        
        
Year 3 = 2s
Year 2 = 3 + x 
Year 1 = x
s = second year
x = first year 
2s = 26 
s = 13
The second year they made 13 million 
13 - 3 = 10 
x = 10 
They made 10 million the first year.