Answer
$4^3$
Work Step by Step
An exponent represents repeated multiplication.
$\underset\uparrow e^{b\ \leftarrow\ number\ of\ times\ the\ base\ appears\ as\ a\ factor}$
the base is the factor that is multiplied
$4\times4\times4=4^3$
4 is the factor so is the base. The factor appears 3 times so the exponent is 3.
