Solve:
it takes an elevator 4 seconds to travel from the first floor to the fourth floor. how long does it take the elevator to travel from the first floor to the sixteenth floor?

To find the inverse of a number a, one can use the equation f(c) = a-1/c=0 where c is the inverse of a use the secant method of finding roots of equations to find the inverse of a = 2.5 ,er = 0.001%