A train is traveling at a speed of 90 miles per hour (mph). The engineer reduces the train's speed by 40% before entering the town of Plymouth. She then increases the train's speed by 50% as it leaves Plymouth. What is the new speed of the train after it leaves Plymouth?

What is the length of an with endpoints a 3,2 and b 8,14

Determine whether the following statements are true and give an explanation or counterexample. bold a. when using the shell method, the axis of the cylindrical shells is parallel to the axis of revolution. bold b. if a region is revolved about the y-axis, then the shell method must be used. bold c. if a region is revolved about the x-axis, then in principle it is possible to use the disk/washer method and integrate with respect to x or the shell method and integrate with respect to y.

36x2 + 49y2 = 1,764 the foci are located at: a) (-√13, 0) and (√13,0) b) (0, -√13) and (0,√13) c) (-1, 0) and (1, 0)