#### Answer

Standard form: $3a^3+5a^2+1$
Degree = 3
Number of terms = 3
This polynomial is a cubic trinomial.

#### Work Step by Step

RECALL:
A polynomial is written in standard form if its terms are written in descending degree.
Thus, the standard form of the given polynomial is:
$3a^3+5a^2+1$.
This polynomial has degree 3 and has three terms. It is a cubic trinomial.