A hiker starts hiking in Death Valley at an elevation of 143 feet below sea level. He climbs up 435 feet and enjoys the view. Then he climbs up another 267 feet. What is his new elevation relative to sea level?
First you want to take 435 and subtract it by 143 which is 292 then you want to add 292 + 267 which is 559 so 559 is your new elevation related to sea level (if an explanation is needed just ask I can give you one)
