Please help on Problem Solving

1. For every integer K from 1 to 10, inclusive, the Kth term of a certain sequence is given by (-1)^k+1 . (1/2^k). If T is the sum of the first 10 terms in the sequence, then T is a. greater than 2 b. between 1 and 2 c. between 1/2 and 1 d. between 1/4 and 1/2 e. less than 1/4 2. For which of the fo...