Exploring Pre-Algebra Concepts: Day 2 Review

What is a variable in algebra?

• A number that is always known

• A letter that represents an unknown number

• A symbol that represents an operation

• A constant value

In the expression 5x + 3, what is the coefficient?

• 3

• 5

• 8

• x

When evaluating the expression 3x - 1 for x = 2, what is the result?

• 1

• 5

• 6

• 7

What is the purpose of using parentheses when substituting values in algebraic expressions?

• To simplify the expression

• To indicate addition

• To avoid confusion between variables and multiplication

• To change the order of operations

Which of the following are like terms?

• 4x and 5

• 2x and 3y

• 9y and -10

• 7c and -8c

How do you combine the like terms 2x and 7x?

• Add them

• Divide them

• Subtract them

• Multiply them

What is a solution to an equation?

• A value that makes the equation true

• A value that makes the equation false

• A value that simplifies the equation

• A value that changes the equation

If x = 5, is it a solution to the equation 2x - 1 = 9?

• No, because 2(5) - 1 equals 7

• Yes, because 2(5) - 1 equals 8

• No, because 2(5) - 1 equals 10

• Yes, because 2(5) - 1 equals 9

What is the first step in solving the equation 4z + 1 = 41?

• Multiply both sides by 4

• Add 1 to both sides

• Subtract 1 from both sides

• Divide both sides by 4

In the equation 9z - 5 = -50, what is the value of z?

• 45

• -45

• -5

• 5