Andrea purchased 10 packs of trading cards online and received a 20% discount of each pack shipping cost 3.99 write an algebraic expression to represent the total cost of the trading cards with the shipping cost

Let x = the cost of a pack of trading cards in dollars.

Because Andrea bought 10 packs, the cost is $10x.

She received a 20% discount, so the cost decreased to

0.8*$10x = $8x

The shipping cost is $3.99.

Answer:

y = 8x + 3.99

where

x = cost of a pack of trading cards in dollars

y = total cost wih 20% discount, including shipping