Chapter 1, Equations and Inequalities - 1.6 Solve Inequalities - 1.6 Exercises - Problem Solving - Page 46: 55

$0 \le Fern < 500$ $500 \le Fir < 1400$ $1400 \le Columbine< 2000$ $2000 \le Bellflower < 2429$

According to the information given, we can write the following inequalities: Ferns grow $=>$ Lowland $0-500m$ $0 \le Fern < 500$ Pacific silver fir grows $=>$ $500-1400m$ $500 \le Fir < 1400$ Columbine grows $=>$ $1400-2000m$ $1400 \le Columbine< 2000$ Piper's bellflower grows $=>$ $2000-2429m$ $2000 \le Bellflower < 2429$