I dont know this? pls help

What should be done to solve the equation? x+14=21 add 14 to both sides of the equation. subtract 14 from the left side of the equation. add 14 to the left side and subtract 14 from the right side of the equation. subtract 14 from both sides of the equation.

What is this inequality notation? t is less then or equal to 2

Which two undefined geometric terms always describe figures with no beginning or end?