0.9 x 10^4
Let’s break this down into steps.
So to start off with, you need to do 4.5/5 which = 0.9. 
Now we can deal with the indices. 10^-3 / 10^-7 means we have to subtract them. Therefore, -3 - -7 = 4. Altogether, we have 0.9 x 10^4
The question states we should leave our answer in standard form.
So our answer is 0.9 x 10^4.
        
             
        
        
        
The most simplified version of it is 49/50
 
        
                    
             
        
        
        
To find the exterior angle measure we would use the following formula: 

A regular hexagon has 6 sides so we divide: 
360/6 which equals 60 
So our final answer would be A. 60 
 
        
        
        
Answer:

Step-by-step explanation:
Start by determining the simpler angle  (or, the complement of the highlighted angle in red on your image). The cosine of that angle is
 (or, the complement of the highlighted angle in red on your image). The cosine of that angle is 

Now, back to the actual red-circled angle. That one is going in the negative direction and ends up in the same position on the unit circle. Since cosine is an even function, its value is the same whether you evaluate at an angle theta, or its complement 2pi-theta. So, the final answer is: 