1. (3 + xz)(–3 + xz)
2. (y² – xy)(y² + xy)
3. (64y2 + x2)(–x2 + 64y2)
Explanation
The difference of 2 squares is in the form (a+b)(a-c).
(3 + xz)(–3 + xz) = (3 + xz)(xz -3)
                            = (xz + 3)(xz - 3)
                           = x²y²-3xy+3xy-9
                           =x²y² - 3²
(y² – xy)(y² + xy) = y⁴+xy³-xy³-x²y²
                           = y⁴ - x²y²
(64y2 + x2)(–x2 + 64y2)= (64y²+x²)(64y²-x²)
                                       = 4096y⁴-64y²x²+64y²x²-x⁴
                                       = 4096y⁴ - x⁴
 
        
             
        
        
        
1) 12
2) 2y
3) 12+2y
4) 12+2y
        
                    
             
        
        
        
I believe it is 48. 
0+3=3
3+5=8
8+7=15
15+9=24
24+11=35
35+13=48
        
             
        
        
        
Answer:
Median is 18.
Mean is 22.
Step-by-step explanation:
Median has to be ordered from least to greatest:
1, 9, 17, 18, 25, 41, 43 
then the median is the number in the middle, which is 18.
Mean is the sum of all the numbers, divided by 7 (because there are 7 numbers given)
25+18+9+1+43+17+41= 154
154/7 = 22