define the term constant and variable
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constant :
fixed value
variable:
not consistent or having a fixed pattern; liable to change
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Answer:
A symbol which has a fixed numerical value is called a constant.
For example:
2, 5, 0, -3, -7, 2/7, 7/9 etc., are constants.
Number of days in a week represents a constant.
In the expression 5x + 7, the constant term is 7.
A quantity which has no fixed value but takes no various numerical values is called a variable.
For example:
Temperature at different times of a day represents a variable.
The height of a student in your grade is a variable, as it varies from student to student. A variable is denoted by a letter like x, y, z, u, v etc.
A combination of a constant and a variable is also a variable.
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