What is the additive inverse of the polynomial –9xy2 + 6x2y – 5x3

 The required additive inverse of the given polynomial is

Step-by-step explanation:  We are given to find the additive inverse of the following polynomial :

Let Q be the polynomial that represents the additive inverse of the polynomial P.

Then, the sum of the polynomials P and  must be zero.

That is,

Thus, the required additive inverse of the given polynomial is

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

step-by-step explanation:

what grade level is this? need to know so i can look in my old textbooks!