The final step of completing a “solve by substitution” problem is to a. solve for the remaining variable. b. write your solution as an ordered pair. c. substitute your solution into one of the equations in the system to check your solution. d. substitute your solution into both of the equations in the system to check your solution.

Anew obstacle course is home to several new types of challenging obstacles. one such obstacle is traversing a 15-stair staircase. to make it more challenging, the stairs are not uniformly spaced. rather, the vertical space between consecutive stairs for the first 10 stairs is 113 feet and the vertical space for the last 5 stairs is 134 feet. what is the total vertical distance traveled ascending and descending the entire 15-stair staircase?