' = foot
8 feet by 8 feet
An area of 64 square feet
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Assuming you mean 84 This means eight to the power of four. That is 8 x 8 x 8 x 8 = 4096
the mean is the average; (9 +8+4 + X)/4 = 8; solve for X ; (21 +X)/4 = 8; X = 11
8/x = x/24x2 = 8 x 24 = 192x = sqrt(192) = 13.8564 (rounded)
Eight cubed means: 8 x 8 x 8 = 512 Eight squared is: 8 x 8 = 64 Eight to the fourth power would be: 8 x 8 x 8 x 8 = 4096 it is the same as 83 (if you didn't know how it looked)
If you mean (11x -8)+7(x -1) then it is 18x -15 when simplified