Writing and Evaluating Expressions - warm up

6a - 3d
when a = 1, d = 2

• 3

• 12

• 1

• 0

Evaluate 3x + 8   if x = 2

• 13

• 14

• 15

• 16

Evaluate 4y  if       y = 3

• 7

• 12

Evaluate 2r + 1      if   r = 3

• 6

• 5

• 7

• 8

Mark goes to Staples and buys x pens for $3 each and y packs of pencils for $4.50 each. Which expression represents the total cost that Mark would pay?

• x + y

• 4.5x + 3y

• 3x + 4.5y

• 5xy

Mrs. Bembry puts $10 in a savings account each month and an extra $20 when she receives money for her birthday. If her birthday was this week, which expression represents the amount of money in her savings account?

• 20m + 10

• 20m - 10

• 10m - 20

• 10m + 20

Samantha had 10 books on her bookshelf. She then bought 2 books each month to add to her collection. Which expression represents the amount of books in her collection now?

• 10 - 2m

• 10 + 2m

• 10m + 2

• 10m - 2

Lisa baked x cookies for her holiday party. About halfway through the party she noticed 12 cookies had been eaten. Which expression represents the number of cookies that are left?

• 24

• x + 12

• 12 - x

• x - 12