Question

r(t)=-t^3 - 2t^2 + t +4
r(1) and r(-2)

Answer 1

I'm assuming you want to know the value of r(t) at r(1) and r(-2).

So, just plug in 1 for t in the expression and do the math. Then, plug in (-2) for t and do it again.

If you get stuck, here's the solution for r(1):

r(1) = 2