![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
(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.
\![\"\"](\"/userfiles/image/steps_images/step2.JPG\")
(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.
\![\"\"](\"/userfiles/image/steps_images/step3.JPG\")
(c) The initial flight path from Houstan to Dallas.
\The initial flight path has a direction and a magnitude.
\Therefore, it is a vector.
\![\"\"](\"/userfiles/image/steps_images/step4.JPG\")
(d) The population of the world.
\The population of the world is a number, it has no direction.
\Therefore, it is a scalar.
\![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
(a) Scalar.
\(b) Vector.
\(c) Vector.
\(d) Scalar.