Answer:
x=128°
Step-by-step explanation:
90+38=128
 
        
             
        
        
        
The first choice is correct. No, the rectangle cannot have x=60 and y=11 because x=48+2y. 
Perimeter is x=2w+2y. Therefore x=2(24)+2(11) which equals 70 not 60.
        
             
        
        
        
Answer: 11.5%
 
Explanation:Since 1 minute = 60 seconds, we multiply 12 minutes by 60 so that 12 minutes = 720 seconds. Thus, we're looking for a probability that the auditor will spend more than 720 seconds. 
Now, we get the z-score for 720 seconds by the following formula:

where 

So, the z-score of 720 seconds is given by:

Let 
t = time for the auditor to finish his work
z = z-score of time t
Since the time is normally distributed, the probability for t > 720 is the same as the probability for z > 1.2. In terms of equation:

Hence, there is 
11.5% chance that the auditor will spend more than 12 minutes in an invoice.