Difference of squares. :)
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2.2 x 1.8 = 3.96
Their sum is -12
The sum means the result of adding the numbers. Therefore the sum of 20 and 15 is 35. 5 times 35 is 175 - therefore 5 multiplied by the sum of 20 and 15 is 175.
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The sum of two numbers is those two numbers multiplied together. For instance, the sum of 4 and 5 is 20.