Aboat can travel at 15 km/ hr downstream and 7 km/ hr upstream, what is the current speed and boat speed?

Can someone with this one pre-calc 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: t= 0.0119s^2 - 0.308s - 0.0003 predict the change in a runner's finishing time with a wind speed of 3 meters/second. note: a negative answer means the runner finishes with a lower time. round to the nearest hundredth.

In which figure is de bc ? a. figure 1 b. figure 2 c. figure 3 d. figure 4

Find percent notation for 0.008 0.008=