6n+6m-m-3n i dont understand that question

Will give brainliest what is the value of x? enter your answer in the box.

Which compound inequality could be represented by the graph?

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax