The elevations in relation to sea level, 0 feet, of some locations in the United States are shown in the table. Which expression can be used to find the distance between the elevations of Mount Washington and New Orleans?

–7 – (–6,288)
6,288 – 7
–7 – 6,288
6,288−(−7)

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads

what is the question? i am guessing you are looking for the area.

to find an area, you have to do length x width.

in this case, it would be 12 ft x 4 ft = 48 sq. ft