Ineed on the following questions, i dont need an explanation just the answer. ( 8th grade math) : )

I'm only going to answer #18. I'm sorry but that is too much work for too little points. If you re-post the questions separately I might have a go at them

18.  x + y =  0

-2x -y = 8

y = -x so...

-2x - (-x) = 8

-2x + x = 8

-x = 8

x = 8

y = - x

y = -8

Hope this helped!

answer: a clock

step-by-step explanation:

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