Determine the Interval on Which the Vector-Valued Function $r ( t ) = 9 e ^ { - t } \mathbf { i } + e ^ { - t } \mathbf { j } + \ln ( t - 5 ) \mathbf { k }$

question 31

Multiple Choice

Determine the interval on which the vector-valued function $r ( t ) = 9 e ^ { - t } \mathbf { i } + e ^ { - t } \mathbf { j } + \ln ( t - 5 ) \mathbf { k }$ is continuous.

• A) \(( 9 , \infty )\)
• B) \(( 5 , \infty )\)
• C) \([ 5 , \infty )\)
• D) \([ 9 , \infty )\)
• E) \(( - 5 , \infty )\)

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