(a) The cost of a theater ticket.
The cost of a theater ticket is a number, it does not have a direction.
Thus, it is a scalar.
(b) The current in a river.
The speed of the river flowing is magnitude and which direction the current is going is the direction.
Thus, the current in a river has both a magnitude and direction.
It is a vector.
(c) The initial flight path from Houstan to Dallas.
The initial flight path has a direction and a magnitude.
Therefore, it is a vector.
(d) The population of the world.
The population of the world is a number, it has no direction.
Therefore, it is a scalar.
(a) Scalar.
(b) Vector.
(c) Vector.
(d) Scalar.
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