4x+7y=-22 i really need what are the letters

Katlyn made 4 dresses with 7 yards of fabric. how many yards did she use on 1 dress?

If the value of cos330°is√3/2 then find cos 165°.

40) linda was making chocolate truffles for the first day of school. the recipe for 20 chocolate truffles is: i cup of cream 2 cups of dark chocolate she noticed this will not be enough truffles for the 42 sure that all students in each homeroom next year. to be sure that all students receive a truffle, linda must adjust her recipe. a. complete the recipe for 42 truffles cups of cream - cups of dark chocolate work: