You can't, a SUM is the amount obtained as a result of adding numbers (18+7=25)
18x7 is asking you to MULTIPLY the two numbers. This is call the PRODUCT of the two numbers (18*7 = 126).
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It is 144:)
(18 x 7) + (24 x 6) + (12 x 3) = 126 + 144 + 36 = 306
24
The sum of the numbers in each row of Pascal's triangle is twice the sum of the previous row. Perhaps you can work it out from there. (Basically, you should use powers of 2.)
In a regular quadrilateral, it's two times the sum of the length and width.