Please help me I need it for my homework thanks

Abox of chocolates costs $7. which equation relates the number of boxes sold (x) and total cost of the boxes sold (y)?

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Elena is paid a constant rate for each hour she works. the table shows the amounts of money that elena earned for various amounts of time that she worked.