A penguin dove to 130 feet below the waters surface. Then it swam up to 48 feet. At what depth is the penguin after it swam up 48 feet?
-130 + 48 = ?
no,
-130-48 = -178
if you think the other way around, the depth started at 130 and then was reduced by 48 as the penguin rose
130-48 = 82
or, as feet from the surface,
-130+48 = -82
Get out your number line, and remember that negative means go left, and positive means go right.
Starting at 0, go left 130 and then go right 48. You wind up 82 to the left.
To determine the depth the penguin is at after swimming up, we need to subtract the distance it swam up from the initial depth it dove to.
Initial depth: 130 feet
Swim up distance: 48 feet
To find the new depth, we subtract the swim up distance from the initial depth:
130 feet - 48 feet = 82 feet
Therefore, the penguin is at a depth of 82 feet after swimming up.