Question

Which of the following is a solution of the compound inequality -1 < 2n + 1 < 5?

Answer 1

-1 < n < 5

n > 2 or n < -1

-1 < n < 2

n < -2 or n > 4

Answer 2

-1 < 2n + 1 < 5 minus 1
-2 < 2n < 4 divide by 2
-1 < n < 2

Answer 3

ohhh.... aha okay ! i see what you did!