Answer:
12
Step-by-step explanation:
3 divided by 1/4 = 3 x 4 = 12
 
        
             
        
        
        
Answer:
Sample mean from population A has probably more accurate estimate of its population mean than the sample mean from population B. 
Step-by-step explanation:
To yield a more accurate estimate of the population mean, margin of error should be minimized. 
margin of error (ME) of the mean can be calculated using the formula
ME= where
 where 
- z is the corresponding statistic in the given confidence level(z-score or t-score) 
- s is the standard deviation of the sample (or of the population if it is known) 
for a given confidence level, and the same standard deviation, as the sample size increases, margin of error decreases. 
Thus, random sample of 50 people from population A, has smaller margin of error than the sample of 20 people from population B. 
Therefore, sample mean from population A has probably more accurate estimate of its population mean than the sample mean from population B. 
 
        
             
        
        
        
Answer:
16
Step-by-step explanation:
The triangle AEC is a right triangle and 2 sides are already filled in.
The hypotenuse is 10 and one side is 6.
So, this is a 3-4-5 right triangle.
Thus, the remaining side EC is 8.
Since EC is congruent to ED, then segment CD is 8+8=16
 
        
             
        
        
        
Answer:
Yes they are similar because they are both right angles but the one on the right is bigger than the one on the left.
Step-by-step explanation:
 
        
             
        
        
        
Step-by-step explanation:


5(a-3)(a-3)
5(a-3)^2

X^4(2x+1) - (2x+1)
(x^4-1)(2x+1)
(x^2-1)(x^2+1)(2x+1)
(x-1)(x-1)(x^2+1)(2x+1)