A submarine sescended to a level 230 m below the surface of the ocean. Later it ascended 95 m and then dove 120 m. What was the new depth of the submarine?
2006-08-20 15:26:50 · 20 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
230 - 95 + 120 = 255 m below the surface
or you could look at it like a vertical number line:
surface of the ocean = 0 m
it descends 230 m (subtract 230): 0 - 230
it ascends 95 m (add 95): 0 - 230 + 95
then dives 120 m (subtract 120): 0 - 230 + 95 - 120
0 -230 + 95 - 120 = -255
since our answer (-255) is a negative number, that means that the submarine is 255 m below 0. In other words, it ends at 255 m below the surface.
2006-08-20 15:32:44 · answer #1 · answered by lcamccandlj 3 · 0⤊ 0⤋
Think of going down 230m as -230. Going up 95m means +95, then dive back down 120, is -120. Then what you have is
-230 + 95 - 120 = -255
the answer is negative because we are talking about measurements BELOW the water surface. So the answer is 255 meters below water surface.
2006-08-20 15:37:55 · answer #2 · answered by kim t 3 · 0⤊ 0⤋
lets not panic here, we are not underwater, just the submarine
this is pretty simple if you just go through each movement and watch your signs
so, we start out 230 meters below the surface, the easiest way to keep track is to call that negative 230 (-230)
then it ascendad (went up) 95 meters, that is plus 95 (it went up)
then it dove 120 m (down, so that is negative again, -120)
altogether that is:
-230+95-120=-255
minus 255 means 255 m below sea level
notice how going up 95 m and then back down 120 m is the same as just going down 25 m
230 m down, go down 25 m more, your at 255 m down, just like the arithmetic came out
2006-08-20 15:34:30 · answer #3 · answered by enginerd 6 · 0⤊ 0⤋
The sub started from 0 to -230m. Then it gained 95m. and then dove again - 120
New depth = -230 + 95 - 120 = -255m
2006-08-20 15:32:49 · answer #4 · answered by Anonymous · 0⤊ 0⤋
the part about them driving 120 is in there to trick you
230
-95
=135
they are just 120 away from were they started
2006-08-20 15:35:51 · answer #5 · answered by ladytigerC 1 · 0⤊ 0⤋
i'm too lazy to figure it out but the problem translates to: 230 - 95 + 120 = ?. the answer is how many feet below the sea the sub is.
2006-08-20 15:32:57 · answer #6 · answered by Major Tom 3 · 0⤊ 0⤋
230-90+120
2006-08-20 15:32:23 · answer #7 · answered by gandang lalaki 2 · 0⤊ 1⤋
230 -93 = 135
135 + 120 = 255
255 m
you go up 95, so subtract becasue depth decrease, it go down add because depth increase.
2006-08-20 15:31:16 · answer #8 · answered by Man 5 · 1⤊ 0⤋
230-95+120= 255m
FYI im an eighth grader too:)
2006-08-20 15:33:38 · answer #9 · answered by wordsofapoet 4 · 0⤊ 0⤋
If it sescended 230m below you - that from the 95 o.k then you add the 120m and you should get 255m
2006-08-20 15:36:26 · answer #10 · answered by dccuttie75 6 · 0⤊ 0⤋