Answer:
B
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
b. $2.50
Step-by-step explanation:
Let us take a step by step approach by simplifying each sentence: 
Sentence 1: Hector works 12 hours per week at a part-time  hours per week at a part-time job
Number of hours worked per week  = 12hours
Sentence 2:  His original pay rate was $8.00 per hour. but he recently received a raise of x dollars per hour
    Pay per hour is 8hr, a raise of x gives 8 + x 
Sentence 3: New total wage  = 12(8+x)
Sentence 4:  Amount earned last week  =  $126
   New total wage = Amount earned last week 
                12(8 + x ) = 126 
                  96 + 12x  = 126 
                           12x  = 126 - 96
                            12x  = 30 
                              x = $2.50
Amount of raise is $2.50
 
        
             
        
        
        
Answer: 20x + 20
Step-by-step explanation: In this problem, the 5 "distributes" through the parentheses, multiplying by each of the terms inside.
So we have 5(4x) + 5(4) which simplifies to 20x + 20.