336
t(n) = (4n5 - 50n4 + 260n3 - 640n2 +756n - 210)/30 for n = 1, 2, 3, ...
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125.
125 - x, this is how i see it. you have 125 and it decreases by a number, since you dont know what that number is you put a variable to represent that number.
1 8 27 64 125 ...13 23 33 43 53 63 73 ...1 8 27 64 125 216 343...
These are perfect cubes (of 1, 2 and 3) so the next two are 64 and 125
its 5! 5x5=25 25x5=125 5x(5x5)=125