The Total Numbers of Navy Personnel N (In Thousands) and Marines

question 249

Multiple Choice

The total numbers of Navy personnel N (in thousands) and Marines personnel M (in thousands) from 2000 through 2007 can be approximated by the models
$N ( t ) = 0.194 t ^ { 3 } - 7.88 t ^ { 2 } + 12.9 t + 375$ and $M ( t ) = 0.031 t ^ { 3 } - 0.25 t ^ { 2 } + 6.7 t + 173$
Where t represents the year, with t = 0 corresponding to 2000.
Find and interpret $( N - M ) ( t )$ .

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