Evaluating Variable Expressions
Flashcard
•
Mathematics
•
9th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a variable in mathematics?
Back
A variable is a symbol, often a letter, that represents a number in mathematical expressions or equations.
2.
FLASHCARD QUESTION
Front
What does it mean to evaluate a variable expression?
Back
To evaluate a variable expression means to substitute the values of the variables into the expression and perform the necessary operations to find a numerical result.
3.
FLASHCARD QUESTION
Front
If x = 3, what is the value of the expression 2x + 5?
Back
The value is 2(3) + 5 = 6 + 5 = 11.
4.
FLASHCARD QUESTION
Front
What is the order of operations used when evaluating expressions?
Back
The order of operations is Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right), often abbreviated as PEMDAS.
5.
FLASHCARD QUESTION
Front
Evaluate the expression 4a - 3b if a = 2 and b = 1.
Back
4(2) - 3(1) = 8 - 3 = 5.
6.
FLASHCARD QUESTION
Front
What is a constant in a mathematical expression?
Back
A constant is a fixed value that does not change, unlike a variable.
7.
FLASHCARD QUESTION
Front
How do you simplify the expression 3(x + 4)?
Back
You distribute the 3: 3x + 12.
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