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How many times does each letter appear in the periodic table? How many terms must you add to approximate the series to 4 decimal places? Series: Σ 1/n^2 [1,infinitey)? What is the exact surface area of a right cone with measurements of 36 cm by 54 cm? A scale drawing of a rectangular room has dimensions 72 feet by 40 feet. The scale to be used is 1 in : 8 ft. What will be the perimeter? How do you trace a red blood cell from the left ventricle to the occipital lobe of the brain and back to the left ventricle?