Given =(+(+(t)=etcos(3t)i+etsin(3t)j+3etk find the derivative ′′(t) and norm of the derivative. ′=r′(t)= ‖′‖=‖r′(t)‖= then find the unit tangent vector (t) and the principal unit normal vector (t)

You are saving to buy a bicycle; so far you save 55.00. the bicycle costs 199.00. you earn 9.00 per hour at your job. which inequality represents the possible number of h hours you need to work to buy the bicycle?