Answer: The wingspan is 36 m.
Using a proportion to solve this, we write the scale factor as a ratio first:  19/38, since 19 is the size of the model's length and 38 is the real length.  For the second ratio, we have 18 for the size of the model wingspan and x for the real wingspan:
19/38 = 18/x
Cross multiply:
19*x = 38*18
19x = 684
 
        
             
        
        
        
Step-by-step explanation:
1/2 + 3/4
= 2/4 + 3/4
= 5/4
= 1 and 1/4 miles
 
        
             
        
        
        
Answer:
11.16 units²
Step-by-step explanation:
Area of community area=4.5×6.2= 27.9 units²
Area of vegetable garden=27.9×0.4=11.16 units²
 
        
             
        
        
        
Answer:
No solution
Step-by-step explanation:
Let's solve this system using elimination through addition/subtraction.  Multiply the second equation by (1/2), which results in the system 
y - 4x = 5
4x - y = 8
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0x + 0y = 13.  This is NEVER true.  This system of equation has NO  SOLUTION.