Answer:
387
Step-by-step explanation:
 
        
             
        
        
        
According to given information, 
Equation of Melinda Earning = 75 + 12x
Equation of Marcus Earning = 15x
Where, x = Number of hours they worked.
Now, we need to calculate when they will have same amount of money, so for that instance they shall equal to each other.
75 + 12x = 15x
15x - 12x = 75
3x = 75
x = 75/3
x = 25
After 25 hours, they will have the money = 15(25) = $375
So, your final answer is $375
Hope this helps! 
        
                    
             
        
        
        
Answer:

Here,  denotes the required number.
 denotes the required number.
Step-by-step explanation:
Let  denotes the required number that satisfies the following condition.
 denotes the required number that satisfies the following condition.
''seven times a number is less than or equal to a quantity that is 24 less than that same  number''
Seven times a number is equal to 
Quantity that is 24 less than that same  number is equal to 
Now find the inequality.
As seven times a number is less than or equal to a quantity that is 24 less than that same  number,

 
        
             
        
        
        
The mean of those sets of numbers are 17.5