Vertical stretch/compress is the result which is formed when a function is multiplied by a positive constant.
This refers to an expression that defines a relationship between two types of variables in which one is the independent variable and the other is the dependent variable.
A vertical stretch is derived if the constant is greater than one while the vertical compression is derived if the constant is between 0 and 1.
Vertical stretch means that the function is taller as a result of it being stretched while vertical compress is shorter due to it being compressed and is therefore the most appropriate answer.
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