7(3a + 12) = 168 ← ( divide both sides by 7 )
3a + 12 = 24 ← ( subtract 12 from both sides )
3a = 12 ← ( divide both sides by 3 )
a = 4
OR 
distribute the parenthesis by 7
21a + 84 = 168 ← ( subtract 84 from both sides )
21a = 84 ← ( divide both sides by 21 )
a = 4
 
        
             
        
        
        
Answer:
0.62% probability that randomly chosen salary exceeds $40,000
Step-by-step explanation:
Problems of normally distributed distributions are solved using the z-score formula.
In a set with mean  and standard deviation
 and standard deviation  , the zscore of a measure X is given by:
, the zscore of a measure X is given by:

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
In this question:

What is the probability that randomly chosen salary exceeds $40,000
This is 1 subtracted by the pvalue of Z when X = 40000. So



 has a pvalue of 0.9938
 has a pvalue of 0.9938
1 - 0.9938 = 0.0062
0.62% probability that randomly chosen salary exceeds $40,000
 
        
             
        
        
        
Answer:
y=6
Step-by-step explanation:
-4 + 3y =14
3y= 18
y=6
 
        
                    
             
        
        
        
Answer:
50,000
Step-by-step explanation:
 
        
             
        
        
        
Algebraic expressions are expressions that are represented by variables and constants
The different ways to present algebraic expressions without changing their meaning is by using an equivalent expression
<h3>How to write an algebraic expression differently</h3>
To rewrite an algebraic expression without changing its meaning, we simply rewrite the expression using an equivalent expression.
Assume the expression is:
2x + 3
Another way to write the above expression is:
3 + 2x
This is so because both expressions are equivalent
Hence, the different ways to present algebraic expressions is by using an equivalent expression
Read more about equivalent expressions at:
brainly.com/question/2972832