How do I find the average number of particles hitting the surface poer unit area and per unit time with no information?
        
             
        
        
        
Based on the given conditions, formulate: 
Rearrange unknown terms to the left side of the equation:
Combine like terms:
Calculate the sum or difference:
Divide both sides of the equation by the coefficient of variable:
Answer: k=41/3
        
             
        
        
        
consider X-axis along the east-west direction and north-south direction along Y-axis
A = magnitude of distance traveled by hiker in north-east direction = 30 kilometer
θ = angle of direction of displacement of the hiker relative to x-axis or east direction = 45 degree counterclockwise
A' = component of distance traveled by the hiker along the east direction.
Since the angle is given with the x-axis, the Sin provides the component in Y-direction. hence
Using the equation 
A' = A Sinθ
Inserting the values 
A' = (30) Sin45
A' = 21.2 km
 
        
             
        
        
        
Answer:
$1.25
Step-by-step explanation:
90 / 72 = the cost per student
90 / 72 = 1.25
 
        
                    
             
        
        
        
Answer:
A 18
Step-by-step explanation:
The mode means "The Most". There are more 18's than any other number.