Explain why 7 × 11 ×13 +13 and 7 ×6 ×5 ×4 ×3 ×2× 1× 5 are composite numbers?

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