Write the Word or Phrase That Best Completes Each Statement $f ( x ) = \sqrt [ 3 ] { x }$

Write the word or phrase that best completes each statement or answers the question.
- $f ( x ) = \sqrt [ 3 ] { x }$ is defined on the interval $[ 0,6 ]$
(a) Approximate the area A under the graph of f by partitioning $[ 0,6 ]$ into three subintervals of equal length an choose $u$ as the left endpoint of each subinterval.
(b) Approximate the area A under the graph of f by partitioning $[ 0,6 ]$ into three subintervals of equal length an choose $u$ as the right endpoint of each subinterval.
(c) Express the area A as an integral.
(d) Use a graphing utility to approximate this integral to three decimal places.