Answer: It ended at 1229 on Friday.
Explanation:
Given : During one week, the stock market did the following: Monday rose 18 points, Tuesday rose 31 points, Wednesday dropped 5 points, Thursday rose 27 points and Friday dropped 38 points.
In integers , we use (+) for rise in quantity and (-) for drop in quantity.
If it started out at 1196 on Monday, then
On Friday = 1196 +18 +31-5+27-38 = 1229 [we use (+) for rise in quantity and (-) for drop ]
Hence, it ended at 1229 on Friday.