Answer
The next three terms are $1280,5120,20480$.
The points appear to lie on an exponential curve.
The graph is shown below.
Work Step by Step
The given sequence is
$5,20,80,320,...$
Use table to organize the terms.
Each term is multiplied by $4$ to the previous term. So, the common ratio is $4$.
Multiply a term by $4$ to find the next term.
Plot the ordered pairs $(n,a_n)$.
The complete table is shown below.
