## Algebraic expressions With example Problems and Interactive Exercises

Use the adhering to examples and interactive exercises to learn around Writing Algebraic Expressions.

You are watching: The product of nine and a number

Problem: Ms. Jensen likes to division her course into groups of 2. Usage mathematical symbols to represent all the student in her class.

Solution: Let g stand for the number of groups in Ms. Jensen"s class.

Then 2 · g, or 2g have the right to represent "g teams of 2 students".

In the difficulty above, the variable g represents the variety of groups in Ms. Jensen"s class. A variable is a symbol used to stand for a number in an expression or an equation. The worth of this number can vary (change). Let"s look at at an instance in i m sorry we use a variable.

Example 1: Write each phrase as a mathematical expression.

 Phrase Expression the sum of nine and eight 9 + 8 the amount of nine and a number x 9 + x

The expression 9 + 8 represents a solitary number (17). This expression is a numerical expression, (also called an arithmetic expression). The expression 9 + x represents a worth that can change. If x is 2, climate the expression 9 + x has a worth of 11. If x is 6, then the expression has actually a value of 15. So 9 + x is an algebraic expression. In the next few examples, we will be working specifically with algebraic expressions.

Example 2: Write each expression as one algebraic expression.

 Phrase Expression nine boosted by a number x 9 + x fourteen reduced by a number p 14 - p seven much less than a number t t - 7 the product that 9 and a number n 9 · n or 9n thirty-two divided by a number y 32 ÷ y or

In example 2, each algebraic expression included one number, one operation and also one variable. Let"s look at at an example in i m sorry the expression consists of much more than one number and/or operation.

Example 3: Write each phrase as an algebraic expression utilizing the change n.

 Phrase Expression five more than twice a number 2n + 5 the product the a number and also 6 6n seven separated by twice a number 7 ÷ 2n or three time a number reduced by 11 3n - 11

Example 4: A small company has actually \$1000 to distribute to the employees together a bonus. Exactly how much money will each employee get?

Solution: Let e represent the number of employees in the company. The quantity of money every employee will obtain is stood for by the following algebraic expression:

Example 5: An electrician fees \$45 per hour and spends \$20 a work on gasoline. Create an algebraic expression to stand for his revenue for one day.

Solution: Let x stand for the variety of hours the electrician works in one day. The electrician"s earnings have the right to be represented by the adhering to algebraic expression:

Solution: 45x - 20

Summary: A variable is a symbol provided to represent a number in one expression or one equation. The value of this number have the right to change. An algebraic expression is a math expression that consists of variables, numbers and operations. The value of this expression have the right to change.

### Exercises

Directions: select the algebraic expression that correctly represents the phrase provided. Choose your prize by clicking its button. Feedback to her answer is listed in the results BOX. If you do a mistake, pick a various button.

 1. Fifteen less than twice a number 15 - 2x2x + 152x - 15None of the above.RESULTS BOX:
 2. Three time a number, enhanced by seventeen 3(a + 17)3a + 17(17 + 3)aNone that the above.RESULTS BOX:
 3. The product the nine and a number, reduced by six 9(m - 6)6(9 - m)9m - 6None the the above.RESULTS BOX:
 4. Thirty split by 7 times a number 30 + 7n 30(7n) None of the above.See more: 2004 Honda Crv Maintenance Required Light ? Maintenance Required Light
 RESULTS BOX:
 5. Jenny earns \$30 a day working part time at a supermarket. Compose an algebraic expression to represent the quantity of money she will earn in d days. 30d 30 + d None of the above
 RESULTS BOX: