Answer:
The first number is 20, the second one is 11
Step-by-step explanation:
Let the first number be x and the second number be y 
Since it says "9 is the difference between two numbers", the first equation will be x-y=9
It also says that "their sum is 31". That means the second equation will be x+y=31 
here are the two equations: 
x-y=9
x+y=31
You can solve this any way you like, but I'll show elimination 
add the two equations
x-y=9
x+y=31
2x=40 
divide by 2
x=20
Substitute 20 as x in one of the equations
20+y=31
subtract 20 from both sides
y=11
That means the two numbers are 20 and 11
Hope this helps! 
 
        
             
        
        
        
Answer:
.06 rounded to nearest hundreth 
Step-by-step explanation:
 
        
             
        
        
        
Answer:
19
Step-by-step explanation:
sum means answer to an addition problem, so 41 - 22 = 19, so 22 + 19 = 41
 
        
             
        
        
        
The Y^2 because 4 to the power of 2 would give you 4x4 which gives you 16