Chapter 12 - Vectors and the Geometry of Space - 12.3 The Dot Product - 12.3 Exercises - Page 852: 1

The correct answer is B, C, D, E are meaningful, A,F are not

For an expression to have meaning, we can't have any operation that takes both a scalar and a vector as arguments. Expression A takes the dot product of a scalar and a vector and so is not meaningful, expression B multiplies two scalars and so is meaningful, expression C multiplies two scalars and so is meaningful, expression D takes the dot product of two vectors and so is meaningful, expression E adds two scalars and so is meaningful, and expression F takes the dot product of a scalar and vector and so is not meaningful. The correct answer is B, C, D, E are meaningful, A,F are not