Question 18
The answer is 4 days. 
Because, 
Kevin =3×n
Anita =4+ (2×n)
Equating the two equations. 
3n=4+2n
3n-2n=4
n=4
Question 19
When the solution is (4,1), it means the value of y=1 and x=4. 
The answer is;
y=x-3
y=-3x+13. Since when the values of x and y are substituted they satisfy the system. 
Question 20
The system has no solution.
This is because the line are parallel and they do not intersect to give a solution. 
        
                    
             
        
        
        
The answer is C, 4. 
you combine like terms and that is the answer you get.
 
        
        
        
Answer:
40
Step-by-step explanation:
a^2+b^2=c^2 
therefore c^2-b^2=a^2
41x41=1681
9x9=81
1681-81=1600
Sqrt1600=40
 
        
                    
             
        
        
        
Answer:
The correct answer on e2020 is Account C
Step-by-step explanation: