A new car worth $28,000 is depreciating in value by $4,000 per year. After how many years will the car's value be $12,000?

After .. (4 years, which is the answer) the cars value will be at 12,000. i got it correct

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?