A particle moves on the circle x2+y2=25 x 2 + y 2 = 25 in the xy x y -plane for time t≥0 t ≥ 0 . At the time when the particle is at the point (3,4) ( 3 , 4 ) , dxdt=6 d x d t = 6 . What is the value of dydt d y d t at this time?

Here are the 30 best lifetime baseball batting averages of all time, arranged in order from lowest to highest: 0.319, 0.329, 0.330, 0.331, 0.331, 0.333, 0.333, 0.333, 0.334, 0.334, 0.334, 0.336, 0.337, 0.338, 0.338, 0.338, 0.340, 0.340, 0.341, 0.341, 0.342, 0.342, 0.342, 0.344, 0.344, 0.345, 0.346, 0.349, 0.358, 0.366 if you were to build a histogram of these data, which of the following would be the best choice of classes?