3/5x + 1/4y = -1/2 in standard form

I’m really confused and need to learn this

The complement of an angle is one-sixth the measure of the supplement of the angle. what is the measure of the complement angle?

Acafeteria manager can choose from among six side dishes for the lunch menu: applesauce, broccoli, corn, dumplings, egg rolls, or french fries. he used a computer program to randomly select three dishes for monday's lunch. what is the theoretical probability the applesauce and broccoli will both be offered monday?