Marisa wants to buy a dvd player that runs for at least $150. she already saved $ 80 and plans to save an additional $ 10 each week. write an inequality that represents this problem and explain your answer in detailed steps.

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?