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Use [link] to fill in the appropriate symbol , = , < , or > .

  1. MPG of Prius_____MPG of Versa
  2. MPG of Mini Cooper_____ MPG of Corolla

  1. >
  2. >
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Use [link] to fill in the appropriate symbol , = , < , or > .

  1. MPG of Fit_____ MPG of Prius
  2. MPG of Corolla _____ MPG of Fit

  1. <
  2. <
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Grouping symbols in algebra are much like the commas, colons, and other punctuation marks in written language. They indicate which expressions are to be kept together and separate from other expressions. [link] lists three of the most commonly used grouping symbols in algebra.

Common Grouping Symbols
parentheses ( )
brackets [ ]
braces { }

Here are some examples of expressions that include grouping symbols. We will simplify expressions like these later in this section.

8 ( 14 8 ) 21 3 [ 2 + 4 ( 9 8 ) ] 24 ÷ { 13 2 [ 1 ( 6 5 ) + 4 ] }

Identify expressions and equations

What is the difference in English between a phrase and a sentence? A phrase expresses a single thought that is incomplete by itself, but a sentence makes a complete statement. “Running very fast” is a phrase, but “The football player was running very fast” is a sentence. A sentence has a subject and a verb.

In algebra, we have expressions and equations . An expression is like a phrase. Here are some examples of expressions and how they relate to word phrases:

Expression Words Phrase
3 + 5 3 plus 5 the sum of three and five
n 1 n minus one the difference of n and one
6 · 7 6 times 7 the product of six and seven
x y x divided by y the quotient of x and y

Notice that the phrases do not form a complete sentence because the phrase does not have a verb. An equation    is two expressions linked with an equal sign. When you read the words the symbols represent in an equation, you have a complete sentence in English. The equal sign gives the verb. Here are some examples of equations:

Equation Sentence
3 + 5 = 8 The sum of three and five is equal to eight.
n 1 = 14 n minus one equals fourteen.
6 · 7 = 42 The product of six and seven is equal to forty-two.
x = 53 x is equal to fifty-three.
y + 9 = 2 y 3 y plus nine is equal to two y minus three.

Expressions and equations

An expression is a number, a variable, or a combination of numbers and variables and operation symbols.

An equation    is made up of two expressions connected by an equal sign.

Determine if each is an expression or an equation:

  1. 16 6 = 10
  2. 4 · 2 + 1
  3. x ÷ 25
  4. y + 8 = 40


  1. This is an equation—two expressions are connected with an equal sign.
  2. This is an expression—no equal sign.
  3. This is an expression—no equal sign.
  4. This is an equation—two expressions are connected with an equal sign.
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Determine if each is an expression or an equation:

  1. 23 + 6 = 29
  2. 7 · 3 7

  1. equation
  2. expression
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Determine if each is an expression or an equation:

  1. y ÷ 14
  2. x 6 = 21

  1. expression
  2. equation
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Simplify expressions with exponents

To simplify a numerical expression means to do all the math possible. For example, to simplify 4 · 2 + 1 we’d first multiply 4 · 2 to get 8 and then add the 1 to get 9 . A good habit to develop is to work down the page, writing each step of the process below the previous step. The example just described would look like this:

4 · 2 + 1
8 + 1

Suppose we have the expression 2 · 2 · 2 · 2 · 2 · 2 · 2 · 2 · 2 . We could write this more compactly using exponential notation. Exponential notation is used in algebra to represent a quantity multiplied by itself several times. We write 2 · 2 · 2 as 2 3 and 2 · 2 · 2 · 2 · 2 · 2 · 2 · 2 · 2 as 2 9 . In expressions such as 2 3 , the 2 is called the base and the 3 is called the exponent. The exponent tells us how many factors of the base we have to multiply.

Questions & Answers

How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
how can I make nanorobot?
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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A soccer field is a rectangle 130 meters wide and 110 meters long. The coach asks players to run from one corner to the other corner diagonally across. What is that distance, to the nearest tenths place.
Kimberly Reply
Jeannette has $5 and $10 bills in her wallet. The number of fives is three more than six times the number of tens. Let t represent the number of tens. Write an expression for the number of fives.
August Reply
What is the expressiin for seven less than four times the number of nickels
Leonardo Reply
How do i figure this problem out.
how do you translate this in Algebraic Expressions
linda Reply
why surface tension is zero at critical temperature
I think if critical temperature denote high temperature then a liquid stats boils that time the water stats to evaporate so some moles of h2o to up and due to high temp the bonding break they have low density so it can be a reason
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
Practice Key Terms 2

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Source:  OpenStax, Prealgebra. OpenStax CNX. Jul 15, 2016 Download for free at http://legacy.cnx.org/content/col11756/1.9
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