Engineers have proposed a single-span suspension bridge across 8-km wide strait. The plan includes suspension towers 360 meters high at each end.

Engineers have proposed a single-span suspension bridge across 8-km wide strait. The plan includes suspension towers 360 meters high at each end. 

Use the trapezoidal approximation (n=4) to estimate the total length of the cable (in meters) that is given by the formula in attachment

Round intermediate and final answers to the nearest ten-thousandths.