Understanding Variables and Coefficients

What is a variable in mathematics?

• A symbol representing an unknown value

• A mathematical operation

• A fixed numerical value

• A number that multiplies a constant

In the expression 5x, what is the role of the number 5?

• It is a constant

• It is an exponent

• It is a variable

• It is a coefficient

How do you evaluate the expression 5x when x equals 3?

• Divide 5 by 3

• Add 5 and 3

• Multiply 5 by 3

• Subtract 3 from 5

In the expression 7a + 4, what is the term 4 called?

• A variable

• A coefficient

• A constant

• An exponent

What is the value of the expression 7a + 4 when a equals 2?

• 10

• 22

• 14

• 18