What have seat belts been doing for more than fifty years

Seat belts have been keeping us more safe than without them. They have been keeping us safe and preventing us from the major effects of a car crash.  Of course people die but people get a little less of the damage like your head banging into the steering wheel or flying out the front window from the back image. For some smart cars, when it stops it holds the seat belt back from moving in order to protect you.

I really hope this helped you, if so then please mark brainliest.

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

or