How do u solve y pluse 4 pluse 3(y pluse 2)

On a piece of paper graph f(x)=5•(0.4)^x

Apolynomial function has a root of –6 with multiplicity 1, a root of –2 with multiplicity 3, a root of 0 with multiplicity 2, and a root of 4 with multiplicity 3. if the function has a positive leading coefficient and is of odd degree, which statement about the graph is true?

What is the solution for 6 - 7/8? explain the steps.