Evaluating Algebraic Expressions

When you replace a variable with a value it is called...

• replacing

• substitution

• algebraic

• numerical

Evaluate the following expression. Show your work in your notebook!

x-10(y) when x=40 and y=2

• 60

• 40

• -2

• 20

Evaluate  $\ 32\div y\ \cdot4-4$  when y=4

• 28

• -3

• 45

• 32

Evaluate  $\frac{1}{2}\left(x\right)\div t+5$  when x=20 and t=5 

• 25

• 15

• 10

• 7

Evaluate  $r\div2.4$  when r = 16.8

• 2.4

• 7

• 32

• 1.2

 Evaluate 3t - 12 when t=10

• 120

• 14

• 18

• 60

Evaluate  $xy$  when x = 3 and y = 12

• 42

• 36

• 312

• 43

b² + 4
when b = 3

• 10
• 12
• 13
• 11

Evaluate 3x + 8   if x = 2

• 13
• 14
• 15
• 16

Evaluate m² if m = 5

• 10

• 25