A train travels between two stations that are 63 km apart at an average speed of 35 m / s . How long after leaving the first station did the train arrive at the second station ?

Find the vertex(use the completing the square method), findthe x- and y-intercepts, and sketch the graph offunction. y = 2x2 + 4x - 1

When an object is heated it contracts. a. true b. false

Wave functions describe orbitals in a hydrogen atom. each function is characterized by 3 quantum numbers: n, l, and ml. if the value of n = 2: the quantum number l can have values from to . the total number of orbitals possible at the n = 2 energy level is .