What causes key features of a function to change?

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.

Which best explains why this triangle is or is not a right triangle?

Henry is an avid reader, he devours 90 pages in half an hour how many pages has henry read per minute?