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Variables and Expressions Introduction
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Variables and Expressions Introduction
Choose the best answer where choices are provided. For written answers, use a letter to stand for the unknown number.
Getting to Know Variables and Expressions
1.Which statement best describes a variable in an algebra expression?
- A letter or symbol that stands for a number
- A sign that always means addition
- A number that must stay the same
- A symbol that shows two sides are equal
2.Which choice is an expression, rather than an equation?
- 8 + 2 = 10
- m = 6
- 4m + 9
- 12 = 3 × 4
3.What feature does every equation have that an expression does not need to have?
4.In 6a + 11, write the variable and the constant term.
Build and Interpret Expressions
5.Match each phrase to the expression that represents it. Let n stand for the number.
- A number increased by 12
- Four times a number
- Five less than a number
- A number divided by 3
- Three times a number
- 4n
- n − 5
- 3n
- n + 12
- n ÷ 3
6.Write an algebraic expression for seven more than twice a number k.
7.Identify every variable in the expression 5r + 2s − 8.
8.An art kit costs $4 per brush, plus a one-time $6 supply fee. Write an expression for the total cost of b brushes.
9.A game score starts at 10 points and increases by 3 points for each level completed. Write an expression for the score after completing l levels.
10.Use the expression 3x + 4. If x = 5, what value does the expression have?
11.A rectangle has a length of w inches and a width of 3 inches. Write an expression for its perimeter.
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