From the following choices, the correct step in evaluating: ∫ cos2 5x dx is 1 - cos 10x / 2dx.
        
             
        
        
        
Answer: -4m-10< -22 and -8>22
Step-by-step explanation:
 
        
             
        
        
        
Answer:
17
Step-by-step explanation:
Let the larger number be represented by x 
Let the smaller number be represented by y
from the question, the next equations can be gotten : 
x - y = 9  equation 1 
x = 1 + 2y equation 2 
Substitute for x in equation 1 
1 + 2y - y = 9 
1 + y = 9 
Collect like terms 
y = 9 - 1 
y = 8 
Substitute for y in equation 1 and solve for x (the larger number) 
x - 8 = 9 
x = 9 + 8 
x = 17