Aclimber started descending from 580 feet above sea level keeps going until she reaches 70 feet below sea level how many feet did she descend

Use set builder notation to represent the following set: { -3, -2, -1, 0}

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?

Decide whether the rates are equivalent. 96 miles on 4 gallons, 380 miles on 15 gallons