Suppose Neil Armstrong decided to throw a golf ball into the air while he was standing on the moon and that the height of the golf ball was modeled by the equation below, where s is measured in feet and t is measured in second, s\left(t ight)=-2.72t^2+26.9t+6s(t)=2.72t2+26.9t+6. Find the best approximation for the instantaneous rate of change (velocity) of the golf ball at 7 seconds.