Every 10 years, the population of a small, rural town is recorded. In 1980, the population was 1,800. From 1980 to 1990, the population decreased by 15%. From 1990 to 2000, the population increased by 10%. What was the population of the town in 2000? A. 90
B. 297
C. 1,683
D. 1,710

D

Step-by-step explanation:

1800-(1800*15/100) + (1800*10/100) =

step-by-step explanation:

i have done this all on a piece of paper but idk how to put it on here cuz it needs to be drawn

{x = -1/2 ,   y = -1

step-by-step explanation:

solve the following system:

{2 x + y = -2

{10 x - 3 y = -2

in the first equation, look to solve for y:

{2 x + y = -2

{10 x - 3 y = -2

subtract 2 x from both sides:

{y = -2 x - 2

{10 x - 3 y = -2

substitute y = -2 x - 2 into the second equation:

{y = -2 x - 2

{10 x - 3 (-2 x - 2) = -2

10 x - 3 (-2 x - 2) = (6 x + 6) + 10 x = 16 x + 6:

{y = -2 x - 2

{16 x + 6 = -2

in the second equation, look to solve for x:

{y = -2 x - 2

{16 x + 6 = -2

subtract 6 from both sides:

{y = -2 x - 2

{16 x = -8

divide both sides by 16:

{y = -2 x - 2

{x = -1/2

substitute x = -1/2 into the first equation:

{y = -1

{x = -1/2

collect results in alphabetical order:

answer:   {x = -1/2 ,   y = -1