Hi there! 
345*28923+808(2829) 
The first step put the problem into 2 parts, the first part is 345*28923 
The second part is 808(2829)
The parentheses means to multiply that number that it touches. 
Add the final 2 answers. 
345*28923 = 9,978,435
808(2829) = 2,285,832
Now, add the answers. 
9,978,435 + 2,285,832 = 12,264,267
Hope this helped!~ 
 
        
                    
             
        
        
        
Answer: 
72 parts
Steps:
Convert the 4 hours into minutes. There are 60 minutes in an hour. Therefore, 4 hours = 240 minutes.
Divide 240 minutes by 40 minutes. This equals 6. Therefore, the machinist can produce the 12 parts 6 times in 4 hours.
Finally, multiply the 12 parts by the 6 times he can produce. Therefore, the machinist can produce 72 parts in 4 hours.
        
                    
             
        
        
        
Answer:
   an = 67 -11(n -1)
Step-by-step explanation:
The terms of your arithmetic sequence have a common difference of -11. The first term is 67.
These values can be used in the generic formula for the n-th term:
   an = a1 +d(n -1) . . . . . . first term a1, common difference d
   an = 67 -11(n -1) . . . . . formula for the n-th term
 
        
             
        
        
        
The units are always squared.
The area can be found when given the diameter by first finding the radius.
Circumference can be used to find area.