[15 points]
how can i determine that a arithmetic sequence is a linear function and how can i justify it?

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

Asporting good store is offering 30 percent off of the original price(x) of football cleats. the discount will be reduced by an another $7 before sales tax.

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect