can someone please help I am very confused on these 3 questions

Find a vector parametric equation of the line segment from P, (4, -4, 7) to P, (0, 6, 2). (Your instructors prefer angle bracket notation for vectors.) r (t ) = with 0 S t s 1 XFind the family of vector-valued functions whose second derivatives are given by _ _r(t) = (-2 cos(t), -2 sin(t), 6). (Your instructors prefer angle bracket notation for dt2 vectors.) 2 cos(t),2 sin (t), or + Cit + C2 Find the unique parametrization the initial conditions (0) = (1, 2, -1) and " (0) = (2, -10, 7). (Your instructors prefer angle bracket notation for vectors.) r ( t ) = XConsider a trajectory in space with acceleration vector Sm = (e't, 1, 2t). Solve the initial value problem to find the trajectory ;(t) for the problem with initial velocity 3(0) = (3, G, 2) and initial position RD) = (5, 4, 9). (Your instructors prefer angle bracket notation for vectors.) ' 2 3 r(t)= e_'+4r+4, L+4,%2f5