Which proportion is equivalent to the original equation?

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.

1. are the triangles similar and if so why? what is the value of x? show your work.

Which of the following is the result of expanding