If a train leaves every 12 minutes, and another train leaves every 9 minutse, and bolth have alredy let one parale tracks, at what time will they leave at the same time agine

The answer is: They will leave at the same time again in 36 minutes

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

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11