Evaluating Expressions

What is an expression in mathematics?

What does it mean to evaluate an expression?

Evaluate: $$\text{If } y = -4 \text{ and } z = -3, \text{ what is } (y+z)^2?$$

Evaluate: $$\text{If } p = 6 \text{ and } r = -2, \text{ what is } 4(p-r)?$$

Evaluate: $$\text{If } b = 4 \text{ and } c = 3, \text{ what is } 4(cb+c)?$$

Evaluate: $$\text{If } x = 2 \text{ and } z = 1, \text{ what is } 3(z+x)-x?$$

Evaluate: $$\text{If } y = 5 \text{ and } z = 6, \text{ what is } z^2-(y+4)?$$

What is the order of operations in mathematics?

What is a variable in an expression?

What is a coefficient in an expression?