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7 x 2 = 14
since 4 is 2 times 2 just double 7 twice: 7 doubled = 14 and then 14 double = 28
You can double the multiplication fact 14 to find 28.
-14 - (-3) The double negative cancels out and forms a positive. -14 + 3 = -11 ■
5^14 is not equivalent to 5^(1/4), so it cannot be shown