Evaluation Variables with Expressions

What are the variables in the following expression?

• 3, 4, 1 and 7

• z, x and y

• + and -

• 15

In this expression what is the variable? 
5 + y 

• q

• 5

• y

• +

5p + 4h - 2
Which are the variables? 

• 5p, 4h, 2

• 2

• p, h

• 5, 4

What is the variable in 3x - 5

• x

• 5

• 3

The length of a rectangle is represented by (5x - 3) and the width is (x + 3). If x = 2, then which of the following values is the actual perimeter of this rectangle?

• 18

• 14

• 24

• 20

Evaluate the expression
when x=8 and y=12.
4x − 2y 

• 4(8) − 2(12)

• 0

• 8

• 4

A rectangle has a dimension that is represented by (2c + 1) and another dimension that is (3 + c). If c = 3, then that is the actual area of this rectangle?

• 13 square units

• 42 square units

• 36 square units

• 12 square units

What are the variables in 3x + y

• 3x

• x,y

• x

• y

Write the following statement as a mathematic expression with variable(s):

> The difference of 16 and K is seven.

What branch of mathematics deals with equations with variables?

• Algebra

• Geometry

• Calculus

• Physics