The expressions 5x20, and 10 - represent the lengths of the sides of a
x +4' an x-4 tep
triangle. Write a simplified expression for the perimeter of the triangle.

There are 1872 steps in a building that has 104 floors. each floor has the same number of steps. a second building has the same number of floors but 2 fewer steps between each floor. how many steps are there between each floor of the second building?