Answer :

Answer:

A

Step-by-step explanation:

[tex]p(n)=7n^3,\,p(n)=56\implies 7n^3=56\implies n^3=8\implies \boxed{n=2}[/tex]

Therefore, the answer is A.

Answer:

A) 2

Step-by-step explanation:

p(n) = 7n^3

Let p(n) = 56

56 = 7n^3

Divide each side by 7.

56/7 = 7/7 n^3

8 = n^3

Take the cube root of each side.

∛8 = ∛n^3

2 = n