Write the equation that models the height of the roller coaster

Is the square root of 4 plus the square root of 16 rational?

Precalculus question, image attached.

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%