VOCABULARY
A letter that represents an unknown number.
: What is a variable?
Write an expression for “a number plus 7."
What is x + 7
Evaluate 7 + k when k = 2.
9x
A combination of numbers, variables, and operations.
What is an algebraic expression?
Write an expression for “5 times a number.”
What is 5n or 5 × n?
Write an expression: “8 less than twice a number y.”
2y – 8
A number multiplied by a variable
What is a coefficient?
Evaluate the expression 3 + x when x = 4.
What is 7?
Evaluate 3(k – 2) when k = 10.
24
A number with no variable attached.
What is a constant?
Evaluate 2m – 5 when m = 6.
What is 7?
Write an expression for the perimeter of a square with side length s.
4s