Find an approximation of `(0.99)^5` using the first three terms of its expansion.

Find a,b,and n in the expansion of (a+b)^n if the first three terms of the expansion are 729. 7290 and 30375, respectively.

Find the next three terms of the sequences 5,2,-1,-4

If the sum of coefficient of first half terms in the expansion of (x+y)^ni s256 , then find the greatest coefficient in the expansion.

Find the 4^th term in the expansion of (x-2y)^12 .

Find the middle terms in the expansion of (x+y)^(7) .