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What is a symbol used to represent a quantity that can change called?
It is called a variable.
What is a letter or symbol used to represent an unknown quantity?
A letter or symbol used to represent an unknown quantity is typically called a variable. In mathematics, common variables include letters such as ( x ), ( y ), and ( z ). These variables can stand for different values in equations and expressions, allowing for the representation of general cases and relationships between quantities.
What does X means in Mathematics?
X is the symbol for multiplication, as in 2X2=4 X (or any other letter) is often used to represent an unknown quantity.
Can you graphically represent a vector which has magnitude but no direction?
If a quantity does not have a direction, its a scalar quantity, not a vector quantity.
Why is a fraction of pi better then the decimal of pi?
Since pi is an irrational number it is impossible to represent the exact quantity as a decimal; you can only give and approximate value. However, if you write a fraction that includes the symbol for pi, you are giving an exact quantity.
