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## Homework Statement

A particle moves according to the position function x(t)=ct

^{2}+bt where c=3m/s

^{2}and b=-7m/s. Find the velocity at the origin.

**2. The attempt at a solution**

I tried just taking the derivative and setting t=0 to the equation as so:

v

_{x}(t)=6t-7=6(0)-7=-7 m/s

Although, when I put the answer into WebAssign it says I'm incorrect. I'm not looking for a definite answer since this is my homework but would just like to understand what I am doing wrong.