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www.reference.com/world-view/difference-between-constant-variable-925838b01370e5fa

In mathematics, a variable is a symbol used for a number not yet known, while a constant is a number or symbol that has a fixed value. The value of a variable can change depending on the equation, while the value of a constant always remains the same.

www.reference.com/article/calculate-magnitude-direction-8ac03e17f5ce5772

Vectors are important tools used to illustrate movement and elements, such as force in physics. In order to work with vectors, you have to understand how to find their direction and magnitude. In many cases, materials like grid paper, a protractor, a ruler, and a calculator are necessary.

www.reference.com/article/control-variable-experiments-3ac448c582c5873a

The control variable, also known as the constant variable, is the variable that remains unchanged throughout an experiment. Control variables minimize room for errors as they reduce the factors that can affect the outcome of an experiment.

www.reference.com/article/many-variables-controlled-experiment-a55f5bde8c98874b

Controlled experiments have three types of variables: dependent, independent and controlled. Independent variables, also called manipulated variables, are altered during an experiment. The resulting measurable change is the dependent, or responding, variable.

www.reference.com/article/variable-expenses-aa147ded097f7c82

Variable expenses are costs that change directly and proportionally with changes in production or sales volume. They include advertising, cost of goods sold, hourly wages, sales commissions and shipping costs.

www.reference.com/article/dependent-variable-science-fa09804a2458c349

The dependent variable is the measurable factor that changes due to the effect of another variable in an experiment or series of measurements. It has a relationship with the independent variable, which can be positive or negative. This means that the dependent variable changes in either the same dir

The simplest method for calculating direct labor cost is represented by multiplying the total hours worked times the wage rate for the period of time in question. The equation looks like this: direct labor cost equals total labor hours times labor rate.

www.reference.com/world-view/moderating-variable-146a7718e9e650e9

A moderating variable is a third variable that affects the strength of the relationship between the independent and dependent variable in data analysis. Examples of moderating variables include sex and race.

www.reference.com/article/compound-variables-43131b11d9964e8f

A compound variable is utilized to create an array, typically in an IBM programming language such as REXX. REXX is a procedural language used to create sequentially arranged algorithms and programs. Therefore, an array in REXX programming is a dimensional arrangement of elements, each of which is id