Classify the following as linear,quadratic,or cubic polynomial:
$5t + 3$

(A) The degree of a polynomial is the highest power of the variable present in the expression.
For the polynomial $5t + 3$,the variable is $t$ and its highest power is $1$.
$A$ polynomial of degree $1$ is called a linear polynomial.
Therefore,$5t + 3$ is a linear polynomial.