The median is the middle number of the data plot. Since there 30 numbers, there isn't a exact middle. To find the median you must add the two middle number then divide by 2.
In this case you must add 87 and 88 which gives 175.
Then divide 175 by 2 which gives 87.5
87.5 is the median
add all assets then add all liabilities
if assets is higher she has a positive net worth of the difference
if liabilities is higher she has a negative net worth of the difference
I thought this was a vector problem but no, this is quite easy!
You are correct; this draws the letter W.
The so-called "vector" means for you to translate the same distance. That vector goes left 3 and up 4 -- translate your point at Step 2 left 3 units and up 4 units. There you go!