Answer:
a < 42
Step-by-step explanation:
Question : 4a + 9a - 6a < 42
Answer : 
4a + 9a - 6a < 42
Combine like terms.
13a - 6a < 42
7a < 42
Divide both sides by 7.
a < 42
Hope this helps you :-)
Let me know if you have any other questions :-)
 
        
                    
             
        
        
        
Answer:
6.25%
Step-by-step explanation:
To know the final probability that this has happened, we must multiply the probability of each event, they tell us that the probability that it is a girl is 1/2 and this happened 4 times, therefore:
(1/2) ^ 4 = 0.0625
that is, the probability that 4 girls are born is 6.25%
an unusual probability is considered when it is less than 5%, therefore, although it approaches this figure, it is not unusual
 
        
             
        
        
        
Martin will earn $350 for 28 hours of work.
Step-by-step explanation:
Given, 
Amount earned in 7 hours = $87.50 
Ratio of time to amount earned = 7:87.50
Let, 
x be the amount earned in 28 hours.
Ratio of time to amount earned = 28:x
Using proportion; 
Ratio of time to amount earned :: Ratio of time to amount earned

Product of mean = Product of extreme

Dividing both sides by 7

Martin will earn $350 for 28 hours of work.
Keywords: ratio, proportion
Learn more about proportion at:
#LearnwithBrainly
 
        
             
        
        
        
#1. About 15. 
5x3
#2. About 9
26/3=8 2/3
        
                    
             
        
        
        
D=ab-c    Theres your answer 
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