do the parametric equations x=3t^3+7, y=2-t^3, z=5t^3+1 determine a line? I think they all together determine a line, but I don't know how to explain in a proper way!! please help.

The problem asks me to find a unit vector in the direction of the given vector. The problem is w=i-2j and another is w=2j.

An object moves with constant acceleration a = 2.5 m/s2 in the due North direction. At time t = 2, the velocity of the object is v0 = 5 m/s in the due East direction. What is the magnitude of the velocity at t = 4 s? the way to get the answer is to use Pythagorean theorem, right? I am not sure...

On her way to grandmas, red ridding hood sat down her 1.2kg basket. A wolf came up beside her and began to pull on the basket with a force of 6.4N at an angle 25 degrees with respect to vertical. Red pulled back with force of 12 N. if the net force on the basket is straight up at what angle was...