9. The decrease in population for Lakeside 5,500.
You can find this by taking the new amount and subtracting the original amount. This will give you the net change.
new - old = net change
45,800 - 51,300 = net change
-5,500 = net change
10. The percent increase for Riverview is +51%.
You can find that by looking at the formula for percent change.
51%