Question

Starting from the same place, Karina walks due west and Lucas walks due east

How many feet apart are Karina and Lucas on the number line?
___ft

Answer 1

480 ft

Explanation:

First, every | on the line worth 40: the number of | from 0 to 400/-400 is 10 so -400/400÷10=-40/40. Also, if you go right from 0 it's positive (40) and if you go left to 0 it's negative (-40).

Karina is at - 240 because - 40*6=-240 ang Lucas is at 240 because 40*6=240.

Karina is 240 feet apart from 0 and so does Lucas, so they are 480 feet apart because 240+240=480.