In Exercises 53-55, use the three magic squares illustrated to obtain the answers. 9 14 3 2 10 9 15 11 7 8 13 12 3 5 7 4 9 2 53. Magic Square Examine the 3 by 3 magic squares and find the sum of the four corner entries of each magic square. How can you determine the sum by using a key number in the magic square? 54. Magic Square For a 3 by 3 magic square, how can you determine the sum of the numbers in any particular row, column, or diagonal by using a key value in the magic square? 55. Magic Square For a 3 by 3 magic square, how can you de- termine the sum of all the numbers in the square by using a key value in the magic square?

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Q: . What is the sum of all the numbers from 84 to 995?

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Polynomials

Try substituting 1. You will get 6 and not 0. Try other real values also. What About -2? Let us check.