help please!!

1) Suppose an object moves in space such that it position at time t hours is given by r[r) = (2: + l)! +2t'j + 32"'k . Find the velocity and acceleration vectors at time t: 2. If distances a measured in miles, what is the speed of the object at this time? 2} Find r(t) if 3-1:): (3:3 e:,:e'\"",4:) and r(2)= (2,4,1). 3} Find the arc length paramebezation of r = (25mg. :Jizcosr) if t 2 1 4) Find and graph the domain of f(x. y) = l-xz