Laguna del carbon, a salt lake located in. Argentina, lies 344 feet below sea level. El alto, Bolivia, is located approximately 13,000 feet above sea level. What is the difference in elevation Laguna del Carbon and El Alto?

This positive number is 1/2. First we construct an equation that represents what is being described, with x being our number to find: y = 1/x + 4*x^2 Take the derivative: y’ = -1/(x^2) + 8x Our number would be the value of x where the derivative of y = 0: 0 = -1/(x^2) + 8x Solve for x: 1/(x^2) = 8x 1 = 8x^3 1/8 = x^3 x = 1/2