Two cruise ships are sailing towards each other from Caribbean islands that are 264 km apart. One ship travels 4 km/h faster than the other. If they both started at the same time and meet after 6 h, how fast is
ench ship travelling?

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents

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