Answer:
acute
Step-by-step explanation:
every angle is under 90 degrees
 
        
                    
             
        
        
        
The usual margin of error we strive for is a 95% probability that our estimate is within the margin.   Assuming a normal distribution (and that we have a big enough sample not to worry about t tests) that corresponds to between minus and plus two standard deviations of the mean (remember the 68-95-99.7 rule).   So our margin of error is plus or minus two standard deviations.
Answer: ±2%
 
        
             
        
        
        
Answer: 255
Step-by-step explanation: All you do is subtract 8,745 from 9000. 
 
        
             
        
        
        
I hope this helps you 
2.5.7+2.5.12+2.7.12
70+120+168
358