Lena is riding in a bike race that goes through a valley and a nearby mountain range.
The table gives the altitude (in feet above sea level) for the five checkpoints in the race.
Use the table to answer the questions.
Checkpoint Altitude
(feet above sea level)
1 -66
2 -144
3 1,541
4 2,223
5 -217
(a) The top of a hill rises 429 feet above Checkpoint 5.
What is the altitude of the top of the hill?
(b) How much higher is Checkpoint 3 than Checkpoint 2?