Answer only the second one​

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18

Which equation can be simplified to find the inverse of y = 2x2^2

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?