Answer and explanation:
Advantages of telephone interviews:
They are more convenient than face to face interviews
They are alot more cost-effective 
There is a wider geographical access as you can reach people in other countries too
Disadvantages of telephone interviews:
Questions become has limited complexity as opposed to face to face interviews 
It may be somewhat intrusive for customers and there could also be interference from noise in the background. Also bad connection issues. 
Advantages of internet survey:
Increased geographical access leading to high response rate.
Alot more convenient and flexible than face to face interviews
Low cost advantages
Disadvantages of internet survey:
Inability for individuals who are not online to participate 
Non response bias
Limited complexity of questions, usually close ended questions 
 
        
             
        
        
        
Photographing stars requires you to keep your exposure open for a long time. Taking pictures of star trails would take about 30 minutes to three hours. If you multiply that for the 6 stars stated above in the problem then you would be needing that much time if the stars were close and approximately 3 to 18 hours capture their star trails if they were far apart from each other.
        
             
        
        
        
Answer:
)165.05
Step-by-step explanation:
7.25²=52.56
52.56*3.14=165.05
 
        
                    
             
        
        
        
Answer:
11x9 =99 to find the area of a parallelogram you do base times height
 
        
             
        
        
        
You can always add or subtract 
same value to/from both sides of equation. The same is true about multiplication and division.
In your case you have to subtract 
x from both sides of equation in order to get rid of it on the left side:


But it's easier to remember that if you want to move some member of equation to other side, you just have to 
change it's sign. Let's practice a bit using your equation (I have added "plus" signs where they are usually omitted to better understend what's going on):

Move 
2y to the right side:

Move 
8 to the left side:

Move both 
x and 
2y to the right side: