Abdul is riding in a bike race that goes through a valley And a nearby mountain range. The table gives the altitude (in feet of bu sea level) for the five checkpoints in the race use the table to answer the questions.

In this case for a)
Check point 4 is located at -213ft above the sea level
So we need to add 124 to the checkpoint 4 altitude
[tex]-213+124=-89[/tex]for the b)
[tex]1897-(-75)=1897+75=1972[/tex]ANSWER
a)-89ft
b)1972 ft lower