x = 2
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math order operation is : x : + - so: 6-4x6x-8x2 = 6 - [4 x 6 x (-8) x 2] = 6 - (-384) = 390
The square root of 20 is simplified as: ± 4.5
No. It is already in simplified form. It equals 0.3333 as a decimal.
That can't be simplified - 143 and 20 have no common factors.
13/20 cannot be simplified further.