The edge of a cube is 80 cm long. How will its volume and surface area change if it's edge is decreased by 10%?
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Step-by-step explanation:
Answer. Step-by-step explanation: If you decrease its side by 10%, you now have a cube with a 72cm side. , or 6*6400, or 38400 sq cm. , or 6*5184, or 31104. The decrease is 7296, which is 19%.
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The average of cubes of first n natural numbers = n(n+1)2/4. The average of odd numbers from 1 to n = (last odd number+1)/2. The average of even numbers from 1 to n = (last even number+2)/2. The average of squares of first n odd numbers = (2n+1)(2n-1)/3.
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