Answer: 233 people per thousand 
Step-by-step explanation:
 Using extrapolation method, 
if 150/k in 1950,
   200/k in 1990,
   275/k in 2020,
2003 lies in between 1990 and 2020. So, you extrapolate the values of 200/k and 275/k for the years respectively.
Therefore,  
(2003 - 1990)/(2020 - 2003) = (x - 200)/(275 - x)
Where x is the number of retirees per thousand for 2003
Making x the subject of relation in the above equation.
Cross multiply the equation above;
(2003 - 1990)(275-x) = (2020 - 2003)(x - 200)
13(275 - x) = 17(x-200)
3575 - 13x = 17x - 3400
Collect the like terms
3575+3400 = 17x + 13x
30x = 6975
x = 6975/30
x = 232.5
x = 233 people per thousand to the nearest integer 
 
        
             
        
        
        
Answer:
12xy
Step-by-step explanation:
Each term is separated by a function sign. In this case, an addition symbol. 
 
        
             
        
        
        
Answer:
Jack is 18 years old
 
Step-by-step explanation:
100:5=20
20-2=<u>18</u>
 
        
             
        
        
        
15 minutes= 2 problems 
75 / 15 = 5
2 x 5 = 10 problems