27 plus 81 is 108. This is because if you add the ones place, which would be the 7 of 27 and the 1 of 81 you get 8, which becomes the answer's one place. You then do the same thing except with the tens place, which are the numbers 2 and 8. Since this gives you 10, a double digit number, the 0 stays in the tens place and the 1 carries over to the hundreds place. So if you put the 8 in the ones place, 0 in the tens place, and 1 in the hundreds place, you get the number 108.
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It is 54 plus 27 = 81
18 + 36 + 45 + 9 + 9 + 54 + 27 + 72 + 81 = 351
3x2 + 36x + 81 = 3(x2 + 13x + 27)
tan(9) + tan(81) - tan(27) - tan(63) = 4
24a3 + 81factor out a 33(8a3 + 27)=========