### Variables and Expressions

A

*variable*is used to represent an unknown number or value.An

*algebraic expression*combines numbers and variables with arithmetic operations.Review these terms: product, factor, power, base, exponent

Practice translating verbal expressions into algebraic expressions. This is an essential skill you will need to solve word problems throughout this course.

*Evaluating an expression*means to find the value of the expression.

## Variables and Expressions

## Write an algebraic expression for:

Five less than the sum of x and y

- 5 less than x + y

**x** **+** **y** − **5**

## Write an algebraic expression for:

The product of the square of a and the cube of b

**a**^{2} ·**b**^{3}

## Write an algebraic expression for:

The sum of four times and seven, divided by the difference of 2 minus the square of

- 4g + 7
- 2 − x
^{2}

### [(**4****g** **+** **7**)/(**2** − **x**^{2})]

## Write an algebraic expression for:

The sum of six times m and eight minus n

- 6 ·m
- 6m
- 8 – n

### ( **6****m** ) **+** ( **8** − **n** )

## Write an algebraic expression for:

The difference of nine times s and three less than r, divided by the product of the square of t

- 9s − ( r − 3 )
- t
^{2}

### [(**9****s** − ( **r** − **3** ))/(**t**^{2})]

## Write an algebraic expression for:

The product of seven times the difference of two and c

- 2 – c

**7** ·( **2** − **c** )

## Write an algebraic expression for:

The product of sixteen times u, divided by the difference of v and twenty three

- 16 ·u
- 16u
- v − 23

### [(**16****u**)/(**v** − **23**)]

## Write an algebraic expression for:

The square of twenty divided by x

- [20/x]

### ( [(**20**)/(**x**)] )^{2}

## Write an algebraic expression for:

The product of eighteen times eleven less than the cube of r

- r
^{3}− 11

**18** ·( **r**^{3} − **11** )

## Write an algebraic expression for:

The difference of five times d and the cube of e

- 5 ·d
- 5d
- e
^{3}

**5****d** − **e**^{3}

*These practice questions are only helpful when you work on them offline on a piece of paper and then use the solution steps function to check your answer.

#### Answer

## Variables and Expressions

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

1 answer

Last reply by: Dr Carleen Eaton

Mon May 13, 2013 12:19 AM

Post by Shoshana C on May 11, 2013

How do you know that m and n are equal?

2 answers

Last reply by: Elena Doskalovich

Mon Jun 10, 2013 9:13 AM

Post by Leilani Greenwood on January 5, 2013

Will there be any practice problems?

1 answer

Last reply by: Dr Carleen Eaton

Thu Dec 27, 2012 12:21 AM

Post by Mary Galanopoulos on December 26, 2012

Would you put parenthesis around the m and n?