Answer: The value of y is 39.6 when x = 11 and the required expression is y(11) = 39.6
Step-by-step explanation:
Since we have given that 
y varies directly as x.
If y = 18, when x = 5.
So, we need to find the value of y when x is 11.
According to question, we get that 

Hence, the value of y is 39.6 when x = 11 and the required expression is y(11) = 39.6
 
        
             
        
        
        
The graphical representation is give in image 
 
        
             
        
        
        
Answer:
 
 
Step-by-step explanation:
A=2i+3j+4k
B=i-2j+3k
Sum of the vectors:
A + B = 2i+3j+4k + i-2j+3k = 3i + j + 7k 
 
 
Direction of the sum of the vectors:
