It's not clear where point Y is located. If Y is the midpoint, and Y is on line XZ, then we can say that XY = 25 and YZ = 25 (since Y cuts XZ in half; the two equal portions are XY and YZ)
I'm using the segment addition postulate XY+YZ = XZ
However, all of this is based on the assumption that Y is the midpoint and on line XZ. 
        
             
        
        
        
Answer:
144
Step-by-step explanation:
225-81 because with pythagorean thorem both sides should equal the C value or the bigger square.
 
        
             
        
        
        
Answer:
Given:
Sample size, n = 640
Since result showed that 99.2% of them would erase all of their personal information online if they could, we have:
P' = 99.2% = 0.992
Let's take p = 50%
Our null and alternative hypothesis will be :
H0 : u = 0.5
H1 : u > 0.5
In this case we are to check for the test statistic. 

 
= 24.9
Test statistic, Z = 24.893
In conclusion, the results are significantly high, which suggets there is suffcient evidence to support the claim that most adults would erase all of their personal information online. 
 
        
             
        
        
        
Answer:
True
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
£7.3 
Step-by-step explanation:
2 x £2=£4
3 x £3 = £6
3 x 90 = 270 = £2.7
£4+£6+£2.7= £12.7
20-12.7=7.3
7 pounds and 3