Choose the missing step in the given solution to the inequality −x − 3 < 13 + 3x.

-x-3 < 13+3x

add x to each side

-3 < 13 + 4x

subtract 13 from each side

-16 < 4x

divide by 4x

-4 < x

f(x) is going down by 4

step-by-step explanation:

(its either that or its going left by 4)

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