Which equation shows the inverse property of multiplication?

Inverse property of multiplication implies that when two number are multiplied, the result is 1. 4 + (-4) = 0. here in this equation is when we multiply 4 and - 4 the answer will not be 1.-8 + (-3) = -3 + (-8) This equation shows the property of multiplicative inverse. The 2 nd equation is showing the inverse of the multiplication property.

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