Question

In a construction site a lift started moving up from 300 feet below sea level.It stopped at a hight 200 feet above sea level. what was the lift's change in altitude?​

Answer 1

Answer:

100ft.

Step-by-step explanation:

$height \: at \: which \: the \: lift \: started = - 300ft.$

$height \: at \: which \: the \: lift \: stopped = - 200ft$

Let the change in altitude of the lift be x

$- 300 + x = - 200$

$x = - 200 + 300$

$x = 100$

$\therefore \: the \: change \: in \: altitude = 100ft.$

Therefore, the change in altitude of the lift is 100ft.

Answer 2

Answer:

500 ft

Step-by-step explanation:

Height from which lift started = -300 ft

Height at which lift stopped = 200 ft

Let the change in altitude be "x"

-300 + x = 200

x = 200 + 300

x = 500

Therefore change in altitude = 500 ft