Question

x(t)=-1/3t3+2t2+5t                   t=5сек

Answer 1

X ( T ) = T * ( - 13T^2 + 2T + 5 ) 
X ( 5 ) = 5 * ( - 13 * 25 + 15 ) = 5 * ( - 253 + 453 ) = 5 * (-203) = ( -1003) = 
= ( - 33 13)