Yes, Bobby will have enough money if he saves for 9 weeks. You can find this through either substituting w for 9 in the equation, or solving the equation itself. 
Substituting:

Substitute w for 9. 

Simplify. 

Solve. 
255 is greater than 250, so yes, he will have enough money saved. 
Solving the equation:

Original Equation

Subtract 30 from both sides. 

Divide both sides by 25. 
The number of weeks he needs is 8.8. When rounding it up, you get 9. 
 
        
        
        
Answer: b 
Step-by-step explanation: 600 is the total so, just do 10x and 12
 
        
             
        
        
        
<span>The rate of change would be equal to the amount of money that Kenny is earning every week, since there are no expenses that are removing money from his account. In this case, it would be the $150 that he is putting into the account weekly.</span>
        
             
        
        
        
<h3>Solution :</h3>

By cross multiply, we get






Therefore, answer is 
 
        
        
        
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