Altitude above seal level is given in positive values and below sea level is given in negative values. Which situation describes a hiker at an altitude of 0 feet? A) The hiker starts at 0 feet then increases altitude by 10 feet.
B) The hiker starts at -10 feet then increases altitude by 10 feet.
C) The hiker starts at 10 feet then increases altitude by 10 feet.
D) The hiker starts at -10 feet then decreases altitude by 10 feet