Writing Expressions

What does 'triple the sum of x and 5' mean in mathematical expression?

• 3(x + 5)

• x + 15

• 3x + 5

• 15x

How do you express '5 less than the product of 6 and s'?

• 6s - 5

• 5 - 6s

• 6s + 5

• 5 + 6s

What is the difference between an expression and an equation?

• An expression has an equality sign, while an equation does not.

• An expression is a mathematical phrase, while an equation is a statement of equality.

• An expression can only contain numbers, while an equation can contain variables.

• An expression does not have an equality sign, while an equation does.

What does 'the product of 4 and a number' mean?

• 4n

• 4 + n

• 4 - n

• 4 / n

Define 'variable' in mathematics.

• A fixed number that does not change.

• A symbol, often a letter, that represents an unknown value.

• A type of equation that has no solution.

• A mathematical operation involving addition and subtraction.

How would you write '15 miles less than Debbie' in an expression?

• d + 15

• d - 15

• 15 - d

• d / 15

What does 'less than' indicate in a mathematical expression?

• It indicates subtraction from a number.

• It indicates addition to a number.

• It indicates multiplication of a number.

• It indicates division of a number.

How do you express 'the sum of a number and 10'?

• n + 10

• n - 10

• n * 10

• n / 10

What is the expression for 'a number decreased by seventeen'?

• n - 17

• n + 17

• 17 - n

• n / 17

What is the expression for 'u decreased by 17'?

• u + 17

• u - 17

• u / 17

• 17 - u