Using the vertex of the quadratic function, it is found that:
a) The maximum number of customers in the store is at 12 P.M.
b) 75 customers are in the store at this time.
The number of customers in x hours after 7 AM is given by:

Which is a quadratic equation with coefficients 
Item a:
The maximum value, considering that a < 0, happens at:

Hence:

5 hours after 7 A.M, hence, the maximum number of customers in the store is at 12 P.M.
Item b:
The value is y(5), hence:

75 customers are in the store at this time.
A similar problem is given at brainly.com/question/24713268
 
        
             
        
        
        
Answer:
 2 y = 100
10 y = 20
20 y = 10
Step-by-step explanation:
To find the answer divide Y by X since y is 200 in the first and x is 1 divide 200 by the second one and you will find you answer.
 
        
             
        
        
        
Answer:24
Step-by-step explanation:
Multiply 3 times ten, 2 times 9, and 6 times 4 and solve you get 24
 
        
             
        
        
        
ANSWER:
The surface area of the star is 3.2700 x  square kilometres.
 square kilometres.
EXPLANATIONS:
Diameter of the star = 1.8083 x  Km.
 Km.
Surface area of the star = 4
Where n is the radius of the star.
So that;
 n =  
 
    = 0.90415 x 
n =  0.90415 x  Km
 Km
Thus,
Surface area = 4 x 
                      = 326994889
Surface area = 3.2700 x  
 
Therefore, the surface area of the star is 3.2700 x  square kilometres.
 square kilometres.