You have a square that has a side length of 1 centimeter. Each minute, 2 centimeters are added to the side length. After 10 minutes, what will be the difference between the area of the last square and the area of the initial square in square centimeters (do not include the units in your answer)?

Lightning  Aug 26, 2018

After 10 minutes...the last square will have side lengths of 1 + 10(2) = 21 cm


The area of the last square = 21^2  = 441 cm^2

The area of the first square  is 1^2  = 1 cm^2


The difference in their areas  is   441   -1    =  440



cool cool cool

CPhill  Aug 26, 2018

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