Use a CAS Integration Utility to Evaluate the Triple Integral $\mathrm { F } ( \mathrm { x } , \mathrm { y } , \mathrm { z } ) = \mathrm { x } + \mathrm { y } + \mathrm { z }$

Multiple Choice

Use a CAS integration utility to evaluate the triple integral of the given function over the specified solid region.
- $\mathrm { F } ( \mathrm { x } , \mathrm { y } , \mathrm { z } ) = \mathrm { x } + \mathrm { y } + \mathrm { z }$ over the tetrahedron bounded by the coordinate planes and the plane $\frac { \mathrm { x } } { 3 } + \frac { \mathrm { y } } { 7 } + \frac { \mathrm { z } } { 2 } = 1$

A) 14
B) 28
C) 21
D) $\frac { 56 } { 3 }$