Hello, aaronrj!

I had to read it twice to catch on . . .

We are expected to be familiar with number bases.Suppose is an integer with .

Use the Binomial Theorem and the appropriate row of Pascal's triangle

to find the base-b expansion of

(that is, the fourth power of the number in base b notation).

For example, means:

Then we see that: . means: .

And they are asking for: .

. . Got it?