Three Decimal Places

Multiple Choice

$\text { Find } a _ { \mathbf { N } } \text { at time } t = 0 \text { for the plane curve } r ( t ) = e ^ { 2 t } \mathbf { i } + e ^ { - 6 t } \mathbf { j } \text {. Round your answer to }$ three decimal places.

A) 18.724
B) 23.792
C) 22.264
D) 15.179
E) 22.764