100
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-102 = -10 x -10 = 100
To find 2 times the sum of y and 5, you first need to calculate the sum of y and 5 by adding y and 5 together. Once you have the sum, you then multiply it by 2 to find the final result. The expression for this calculation would be 2(y + 5).
The two numbers in question are 1 and 9. 1 is equal to 1 squared, and 9 is equal to 3 squared.
a2 + a2 = 2a2
9a squared = 81a^2