## College Algebra (11th Edition)

$288$
$\bf{\text{Solution Outline:}}$ To evaluate the given summation expression, $\displaystyle\sum_{i=1}^4 i^i ,$ substitute $i$ with the values from $1$ to $4$ and then simplify the expression. $\bf{\text{Solution Details:}}$ Substituting $i$ with the numbers from $1$ to $4 ,$ the given expression evaluates to \begin{array}{l}\require{cancel} 1^1+2^2+3^3+4^4 \\\\= 1+4+27+256 \\\\= 288 .\end{array}