If the coefficient of the expression axn is positive and the exponent is negative, the expression will be a polynomial.

a. true
b. false

For this case we have the following expression:

Where,

a: coefficient of expression

n: exponent of the expression:

The expression is a polynomial if it meets the following conditions:

1) a ∈ (-∞, ∞)

2) n>0

We observe that the second condition is not fulfilled.

Therefore, the expression is not a polynomial.

B. False: If the coefficient of the expression ax^n is positive and the exponent is negative, the expression will be a polynomial.

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