Question

______are used to represent an unknown quantity in a mathematical expression.

Answer 1

Answer:

Variables are used to represent an unknown quantity in a mathematical expression.

Step-by-step explanation:

• Variables are used to represent an unknown quantity in a mathematical expression.
• For example : x + 2 = 4, here x is the variable.
• We can denote variable by any alphabet i.e, a,b,c,d etc.