Answer:
f(-4) = -5
Step-by-step explanation:
 
        
                    
             
        
        
        
MN = 6 in
add the parts of the ratio, 1 + 2 + 3 = 6
divide AB by 6 to find 1 part of the ratio
 = 3 ← 1 part
AM = 3 in ← 1 part
MN = 2 × 3 = 6 in ← 2 parts
NB = 3 × 3 = 9 in ← 3 parts
and 3 + 6 + 9 = 18 in = AB
 
        
             
        
        
        
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Thus each angle has a measure of 108° degrees.
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