If the length of one side of a square is doubled and the length of an adjacent side is increased by 9, the resulting rectangle has an area that is 324^2. Find the length of a side of the original square.

Aclothing store has the sign shown in the shop window. pani sees the sign and wants to buy 3 shirts and 2 pairs of jeans. the cost of each shirt before the discount is $12, and the cost of each pair of jeans is $19 before the discount. write and simplify an expression to find the amount pani pays if a $3 discount is applied to her total