Canada, Germany, New Zealand, and Japan

For this homework assignement, I decided to do New Zealand as the fourth country as well because I started doing it in class, eventhought I was not supposed to. Below I have calculated for Canada, Germany, New Zealand, and Japan.

Canada: We are looking for the Death rate!
P(2012) = P(2011) + P(2011) (B - D)
34108860 = 34030590 +  34030590  (0.01028 - D)
- 34030590
78270 = 34030590 (0.01028 - D) Use distributive property here!
78270 = 349834.5 - 34030590D
-349834.5
-271564.5    =  -34030590D
-34030590   = -34030590
Since both the denominator and numerator are negative, we can transform them to be positive, which will give us the same result because a negative divided by a negative is positive, and positive divided by positive is positive.
D = 0.00798

Germany: We are looking for the population in 2012!
P(2012) = P(2011) + P(2011) (B - D)
P(2012) = 81471830 + 81471880 (0.0083 - 0.01097)
Since we have both Birth and Death rate, we can immediately subtract them, and move on to the distributive property.
P(2012) = 81471830 - 217529.8
P(2012) = 81254300

New Zealand: We are looking for the birth rate!
P(2012) = P(2011) + P(2011) (B - D)
4045249 = 4027947 + 4027947 (B - 0.00715)
-4027947  
17302 = 4027947B
+28799.8
46101.8  =   4027947B      
4027947 =   4027947   
B = 0.01144

Japan: We are looking for the death rate!
P(2012) = P(2011) + P(2011) (B - D)
126124097 = 126475700 + 126475700 (0.00731 - D)
126124097 = 126475700 + 924537.4 - 126475700D
126124097 = 127400237.4 - 126475700D
-127400237.4
-1276140.4 = -126475700D
-126475700= -126475700
D = 0.0101