1) Allie drops a ball from the top of a 1,250-foot-tall building. The function f(x) = -16x² +1,250 models the height, in feet, of the ball x seconds after it was dropped.
Approximately how long will it take for the ball to hit the ground?

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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