What is an equivalent expression for 2s+(-4s) and what are way for me to remember how to do equations like these

This is so hard and it’s for a test

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

What are the digits that repeat in the smallest sequence of repeating digits in the decimal equivalent of 24/11?