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11. A rectangular steel container (no top) has the outside dimensions shown in the figure. The thickness of the bottom surface is t, and the thickness of side walls ist/2. Determine t if the weight of the container is 1,300 lb. The specific weight of steel is 0.284 lb/in.3. T 80 in. L 120 in - 240 in 22. The U.S. population in selected years between 1815 and 1965 is listed in the table below. Determine a quadratic a quadratic equation in equation in the form P = azt2 + 27t+ao, where t is the number of years after 1800 and P is the population in millions, that best fits the data. Use the equation to estimate the population in 1915 (the population was 98.8 millions). Make a plot of the population versus the year that shows the data points and the equation. Year 1815 1845 1875 1905 1965 1935 127.1 8.3 19.7 44.4 83.2 190.9 Population (millions)