The finishing time for a runner completing the 200-meter dash is affected by the tail-wind speed, s. The change, t, in a runner's performance is modeled by the function shown below:

Predict the change in a runner's finishing time with a wind speed of 4 meters/second. Note: A negative answer means the runner finishes with a lower time.

Round to the nearest hundredth.

Question

The finishing time for a runner completing the 200-meter dash is affected by the tail-wind speed, s. The change, t, in a runner's performance is modeled by the function shown below:

Predict the change in a runner's finishing time with a wind speed of 4 meters/second. Note: A negative answer means the runner finishes with a lower time. 

Round to the nearest hundredth.

dan815 · Answer

Where is the function

anonymous · Answer

t=0.0119s^2-0.308s-0.0003 srry!!

dan815 · Answer

okay we just need to know the change 't', when s= 4

anonymous · Answer

ok

dan815 · Answer

$$t=0.0119s^2-0.308s-0.0003\
s=\color{red}{4}\
t=0.0119(\color{red}{4})^2-0.308(\color{red}{4})-0.0003$$

dan815 · Answer

solve for t

anonymous · Answer

ok

anonymous · Answer

do i do the quadratic formula after that?