The National Oceanic and Atmospheric Administration (NOAA) is a government agency that provides information on water levels, currents, and tides. Scientists at the NOAA track high and low tides to help ships to navigate more safely. Monitoring tides is an important job. Explain what causes high and low tides.

The safe load, l, of a wooden beam of width w, height h, and length l, supported at both ends, varies directly as the product of the width and the square of the height, and inversely as the length. a wooden beam 4 inches wide, 9 inches high, and 240 inches long can hold a load of 6810 pounds. what load would a beam 3 inches wide, 8 inches high, and 144 inches long, of the same material, support? (round off your answer to the nearest integer.)